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Magnanimous numbers

From Rosetta Code
Magnanimous numbers is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

A magnanimous number is an integer where there is no place in the number where a + (plus sign) could be added between any two digits to give a non-prime sum.


E.G.
  • 6425 is a magnanimous number. 6 + 425 == 431 which is prime; 64 + 25 == 89 which is prime; 642 + 5 == 647 which is prime.
  • 3538 is not a magnanimous number. 3 + 538 == 541 which is prime; 35 + 38 == 73 which is prime; but 353 + 8 == 361 which is not prime.


Traditionally the single digit numbers 0 through 9 are included as magnanimous numbers as there is no place in the number where you can add a plus between two digits at all. (Kind of weaselly but there you are...) Except for the actual value 0, leading zeros are not permitted. Internal zeros are fine though, 1001 -> 1 + 001 (prime), 10 + 01 (prime) 100 + 1 (prime).

There are only 571 known magnanimous numbers. It is strongly suspected, though not rigorously proved, that there are no magnanimous numbers above 97393713331910, the largest one known.


Task
  • Write a routine (procedure, function, whatever) to find magnanimous numbers.
  • Use that function to find and display, here on this page the first 45 magnanimous numbers.
  • Use that function to find and display, here on this page the 241st through 250th magnanimous numbers.
  • Stretch: Use that function to find and display, here on this page the 391st through 400th magnanimous numbers


See also


ALGOL 68[edit]

BEGIN # find some magnanimous numbers - numbers where inserting a + between any #
# digits ab=nd evaluatinf the sum results in a prime in all cases #
# returns the first n magnanimous numbers #
# uses global sieve prime which must include 0 and be large enough #
# for all possible sub-sequences of digits #
OP MAGNANIMOUS = ( INT n )[]INT:
BEGIN
[ 1 : n ]INT result;
INT m count := 0;
FOR i FROM 0 WHILE m count < n DO
# split the number into pairs of digit seuences and check the sums of the pairs are all prime #
INT divisor := 1;
BOOL all prime := TRUE;
WHILE divisor *:= 10;
IF INT front = i OVER divisor;
front = 0
THEN FALSE
ELSE all prime := prime[ front + ( i MOD divisor ) ]
FI
DO SKIP OD;
IF all prime THEN result[ m count +:= 1 ] := i FI
OD;
result
END; # MAGNANIMPUS #
# prints part of a seuence of magnanimous numbers #
PROC print magnanimous = ( []INT m, INT first, INT last, STRING legend )VOID:
BEGIN
print( ( legend, ":", newline ) );
FOR i FROM first TO last DO print( ( " ", whole( m[ i ], 0 ) ) ) OD;
print( ( newline ) )
END ; # print magnanimous #
# we assume the first 400 magnanimous numbers will be in 0 .. 1 000 000 #
# so we will need a sieve of 0 up to 99 999 + 9 #
[ 0 : 99 999 + 9 ]BOOL prime;
prime[ 0 ] := prime[ 1 ] := FALSE; prime[ 2 ] := TRUE;
FOR i FROM 3 BY 2 TO UPB prime DO prime[ i ] := TRUE OD;
FOR i FROM 4 BY 2 TO UPB prime DO prime[ i ] := FALSE OD;
FOR i FROM 3 BY 2 TO ENTIER sqrt( UPB prime ) DO
IF prime[ i ] THEN FOR s FROM i * i BY i + i TO UPB prime DO prime[ s ] := FALSE OD FI
OD;
# construct the sequence of magnanimous numbers #
[]INT m = MAGNANIMOUS 400;
print magnanimous( m, 1, 45, "First 45 magnanimous numbers" );
print magnanimous( m, 241, 250, "Magnanimous numbers 241-250" );
print magnanimous( m, 391, 400, "Magnanimous numbers 391-400" )
END
Output:
First 45 magnanimous numbers:
 0 1 2 3 4 5 6 7 8 9 11 12 14 16 20 21 23 25 29 30 32 34 38 41 43 47 49 50 52 56 58 61 65 67 70 74 76 83 85 89 92 94 98 101 110
Magnanimous numbers 241-250:
 17992 19972 20209 20261 20861 22061 22201 22801 22885 24407
Magnanimous numbers 391-400:
 486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

ALGOL W[edit]

begin
 % find some Magnanimous numbers - numbers where inserting a "+" between  %
 % any two of the digits and evaluating the sum results in a prime number %
 % implements the sieve of Eratosthenes  %
procedure sieve( logical array s ( * ); integer value n ) ;
begin
 % start with everything flagged as prime  %
for i := 1 until n do s( i ) := true;
 % sieve out the non-primes  %
s( 1 ) := false;
for i := 2 until truncate( sqrt( n ) ) do begin
if s( i ) then for p := i * i step i until n do s( p ) := false
end for_i ;
end sieve ;
 % construct an array of magnanimous numbers using the isPrime sieve  %
procedure findMagnanimous ( logical array magnanimous, isPrime ( * ) ) ;
begin
 % 1 digit magnanimous numbers  %
for i := 0 until 9 do magnanimous( i ) := true;
 % initially, the other magnanimous numbers are unknown  %
for i := 10 until MAGNANIMOUS_MAX do magnanimous( i ) := false;
 % 2 & 3 digit magnanimous numbers  %
for d1 := 1 until 9 do begin
for d2 := 0 until 9 do begin
if isPrime( d1 + d2 ) then magnanimous( ( d1 * 10 ) + d2 ) := true
end for_d2 ;
for d23 := 0 until 99 do begin
if isPrime( d1 + d23 ) then begin
integer d12, d3;
d3  := d23 rem 10;
d12 := ( d1 * 10 ) + ( d23 div 10 );
if isPrime( d12 + d3 ) then magnanimous( ( d12 * 10 ) + d3 ) := true
end if_isPrime_d1_plus_d23
end for_d23
end for_d1 ;
 % 4 & 5 digit magnanimous numbers  %
for d12 := 10 until 99 do begin
for d34 := 0 until 99 do begin
if isPrime( d12 + d34 ) then begin
integer d123, d4;
d123 := ( d12 * 10 ) + ( d34 div 10 );
d4  := d34 rem 10;
if isPrime( d123 + d4 ) then begin
integer d1, d234;
d1  := d12 div 10;
d234 := ( ( d12 rem 10 ) * 100 ) + d34;
if isPrime( d1 + d234 ) then magnanimous( ( d12 * 100 ) + d34 ) := true
end if_isPrime_d123_plus_d4
end if_isPrime_d12_plus_d34
end for_d34 ;
for d345 := 0 until 999 do begin
if isPrime( d12 + d345 ) then begin
integer d123, d45;
d123 := ( d12 * 10 ) + ( d345 div 100 );
d45  := d345 rem 100;
if isPrime( d123 + d45 ) then begin
integer d1234, d5;
d1234 := ( d123 * 10 ) + ( d45 div 10 );
d5  := d45 rem 10;
if isPrime( d1234 + d5 ) then begin
integer d1, d2345;
d1  := d12 div 10;
d2345 := ( ( d12 rem 10 ) * 1000 ) + d345;
if isPrime( d1 + d2345 ) then magnanimous( ( d12 * 1000 ) + d345 ) := true
end if_isPrime_d1234_plus_d5
end if_isPrime_d123_plus_d45
end if_isPrime_d12_plus_d345
end for_d234
end for_d12 ;
 % find 6 digit magnanimous numbers  %
for d123 := 100 until 999 do begin
for d456 := 0 until 999 do begin
if isPrime( d123 + d456 ) then begin
integer d1234, d56;
d1234 := ( d123 * 10 ) + ( d456 div 100 );
d56  := d456 rem 100;
if isPrime( d1234 + d56 ) then begin
integer d12345, d6;
d12345 := ( d1234 * 10 ) + ( d56 div 10 );
d6  := d56 rem 10;
if isPrime( d12345 + d6 ) then begin
integer d12, d3456;
d12  := d123 div 10;
d3456 := ( ( d123 rem 10 ) * 1000 ) + d456;
if isPrime( d12 + d3456 ) then begin
integer d1, d23456;
d1  := d12 div 10;
d23456 := ( ( d12 rem 10 ) * 10000 ) + d3456;
if isPrime( d1 + d23456 ) then magnanimous( ( d123 * 1000 ) + d456 ) := true
end if_isPrime_d12_plus_d3456
end if_isPrime_d12345_plus_d6
end if_isPrime_d1234_plus_d56
end if_isPrime_d123_plus_d456
end for_d456
end for_d123
end findMagnanimous ;
 % we look for magnanimous numbers with up to 6 digits, so we need to  %
 % check for primes up to 99999 + 9 = 100008  %
integer PRIME_MAX, MAGNANIMOUS_MAX;
PRIME_MAX  := 100008;
MAGNANIMOUS_MAX := 1000000;
begin
logical array magnanimous ( 0 :: MAGNANIMOUS_MAX );
logical array isPrime ( 1 :: PRIME_MAX );
integer mPos;
integer lastM;
sieve( isPrime, PRIME_MAX );
findMagnanimous( magnanimous, isPrime );
 % show some of the magnanimous numbers  %
lastM := mPos  := 0;
i_w := 3; s_w := 1; % output formatting  %
for i := 0 until MAGNANIMOUS_MAX do begin
if magnanimous( i ) then begin
mPos  := mPos + 1;
lastM := i;
if mPos = 1 then begin
write( "Magnanimous numbers 1-45:" );
write( i )
end
else if mPos < 46 then begin
if mPos rem 15 = 1 then write( i )
else writeon( i )
end
else if mPos = 241 then begin
write( "Magnanimous numbers 241-250:" );
write( i )
end
else if mPos > 241 and mPos <= 250 then writeon( i )
else if mPos = 391 then begin
write( "Magnanimous numbers 391-400:" );
write( i )
end
else if mPos > 391 and mPos <= 400 then writeon( i )
end if_magnanimous_i
end for_i ;
i_w := 1; s_w := 0;
write( "Last magnanimous number found: ", mPos, " = ", lastM )
end
end.
Output:
Magnanimous numbers 1-45:
  0   1   2   3   4   5   6   7   8   9  11  12  14  16  20
 21  23  25  29  30  32  34  38  41  43  47  49  50  52  56
 58  61  65  67  70  74  76  83  85  89  92  94  98 101 110
Magnanimous numbers 241-250:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407
Magnanimous numbers 391-400:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081
Last magnanimous number found: 434 = 999994

AWK[edit]

 
# syntax: GAWK -f MAGNANIMOUS_NUMBERS.AWK
# converted from C
BEGIN {
magnanimous(1,45)
magnanimous(241,250)
magnanimous(391,400)
exit(0)
}
function is_magnanimous(n, p,q,r) {
if (n < 10) { return(1) }
for (p=10; ; p*=10) {
q = int(n/p)
r = n % p
if (!is_prime(q+r)) { return(0) }
if (q < 10) { break }
}
return(1)
}
function is_prime(n, d) {
d = 5
if (n < 2) { return(0) }
if (!(n % 2)) { return(n == 2) }
if (!(n % 3)) { return(n == 3) }
while (d*d <= n) {
if (!(n % d)) { return(0) }
d += 2
if (!(n % d)) { return(0) }
d += 4
}
return(1)
}
function magnanimous(start,stop, count,i) {
printf("%d-%d:",start,stop)
for (i=0; count<stop; ++i) {
if (is_magnanimous(i)) {
if (++count >= start) {
printf(" %d",i)
}
}
}
printf("\n")
}
 
Output:
1-45: 0 1 2 3 4 5 6 7 8 9 11 12 14 16 20 21 23 25 29 30 32 34 38 41 43 47 49 50 52 56 58 61 65 67 70 74 76 83 85 89 92 94 98 101 110
241-250: 17992 19972 20209 20261 20861 22061 22201 22801 22885 24407
391-400: 486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

C[edit]

Translation of: Go
#include <stdio.h> 
#include <string.h>
 
typedef int bool;
typedef unsigned long long ull;
 
#define TRUE 1
#define FALSE 0
 
/* OK for 'small' numbers. */
bool is_prime(ull n) {
ull d;
if (n < 2) return FALSE;
if (!(n % 2)) return n == 2;
if (!(n % 3)) return n == 3;
d = 5;
while (d * d <= n) {
if (!(n % d)) return FALSE;
d += 2;
if (!(n % d)) return FALSE;
d += 4;
}
return TRUE;
}
 
void ord(char *res, int n) {
char suffix[3];
int m = n % 100;
if (m >= 4 && m <= 20) {
sprintf(res,"%dth", n);
return;
}
switch(m % 10) {
case 1:
strcpy(suffix, "st");
break;
case 2:
strcpy(suffix, "nd");
break;
case 3:
strcpy(suffix, "rd");
break;
default:
strcpy(suffix, "th");
break;
}
sprintf(res, "%d%s", n, suffix);
}
 
bool is_magnanimous(ull n) {
ull p, q, r;
if (n < 10) return TRUE;
for (p = 10; ; p *= 10) {
q = n / p;
r = n % p;
if (!is_prime(q + r)) return FALSE;
if (q < 10) break;
}
return TRUE;
}
 
void list_mags(int from, int thru, int digs, int per_line) {
ull i = 0;
int c = 0;
char res1[13], res2[13];
if (from < 2) {
printf("\nFirst %d magnanimous numbers:\n", thru);
} else {
ord(res1, from);
ord(res2, thru);
printf("\n%s through %s magnanimous numbers:\n", res1, res2);
}
for ( ; c < thru; ++i) {
if (is_magnanimous(i)) {
if (++c >= from) {
printf("%*llu ", digs, i);
if (!(c % per_line)) printf("\n");
}
}
}
}
 
int main() {
list_mags(1, 45, 3, 15);
list_mags(241, 250, 1, 10);
list_mags(391, 400, 1, 10);
return 0;
}
Output:
First 45 magnanimous numbers:
  0   1   2   3   4   5   6   7   8   9  11  12  14  16  20 
 21  23  25  29  30  32  34  38  41  43  47  49  50  52  56 
 58  61  65  67  70  74  76  83  85  89  92  94  98 101 110 

241st through 250th magnanimous numbers:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407 

391st through 400th magnanimous numbers:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081 

C#[edit]

using System; using static System.Console;
 
class Program {
 
static bool[] np; // not-prime array
 
static void ms(long lmt) { // populates array, a not-prime is true
np = new bool[lmt]; np[0] = np[1] = true;
for (long n = 2, j = 1; n < lmt; n += j, j = 2) if (!np[n])
for (long k = n * n; k < lmt; k += n) np[k] = true; }
 
static bool is_Mag(long n) { long res, rem;
for (long p = 10; n >= p; p *= 10) {
res = Math.DivRem (n, p, out rem);
if (np[res + rem]) return false; } return true; }
 
static void Main(string[] args) { ms(100_009); string mn;
WriteLine("First 45{0}", mn = " magnanimous numbers:");
for (long l = 0, c = 0; c < 400; l++) if (is_Mag(l)) {
if (c++ < 45 || (c > 240 && c <= 250) || c > 390)
Write(c <= 45 ? "{0,4} " : "{0,8:n0} ", l);
if (c < 45 && c % 15 == 0) WriteLine();
if (c == 240) WriteLine ("\n\n241st through 250th{0}", mn);
if (c == 390) WriteLine ("\n\n391st through 400th{0}", mn); } }
}
Output:
First 45 magnanimous numbers:
   0    1    2    3    4    5    6    7    8    9   11   12   14   16   20 
  21   23   25   29   30   32   34   38   41   43   47   49   50   52   56 
  58   61   65   67   70   74   76   83   85   89   92   94   98  101  110 

241st through 250th magnanimous numbers:
  17,992   19,972   20,209   20,261   20,861   22,061   22,201   22,801   22,885   24,407 

391st through 400th magnanimous numbers:
 486,685  488,489  515,116  533,176  551,558  559,952  595,592  595,598  600,881  602,081

C++[edit]

#include <iomanip>
#include <iostream>
 
bool is_prime(unsigned int n) {
if (n < 2)
return false;
if (n % 2 == 0)
return n == 2;
if (n % 3 == 0)
return n == 3;
for (unsigned int p = 5; p * p <= n; p += 4) {
if (n % p == 0)
return false;
p += 2;
if (n % p == 0)
return false;
}
return true;
}
 
bool is_magnanimous(unsigned int n) {
for (unsigned int p = 10; n >= p; p *= 10) {
if (!is_prime(n % p + n / p))
return false;
}
return true;
}
 
int main() {
unsigned int count = 0, n = 0;
std::cout << "First 45 magnanimous numbers:\n";
for (; count < 45; ++n) {
if (is_magnanimous(n)) {
if (count > 0)
std::cout << (count % 15 == 0 ? "\n" : ", ");
std::cout << std::setw(3) << n;
++count;
}
}
std::cout << "\n\n241st through 250th magnanimous numbers:\n";
for (unsigned int i = 0; count < 250; ++n) {
if (is_magnanimous(n)) {
if (count++ >= 240) {
if (i++ > 0)
std::cout << ", ";
std::cout << n;
}
}
}
std::cout << "\n\n391st through 400th magnanimous numbers:\n";
for (unsigned int i = 0; count < 400; ++n) {
if (is_magnanimous(n)) {
if (count++ >= 390) {
if (i++ > 0)
std::cout << ", ";
std::cout << n;
}
}
}
std::cout << '\n';
return 0;
}
Output:
First 45 magnanimous numbers:
  0,   1,   2,   3,   4,   5,   6,   7,   8,   9,  11,  12,  14,  16,  20
 21,  23,  25,  29,  30,  32,  34,  38,  41,  43,  47,  49,  50,  52,  56
 58,  61,  65,  67,  70,  74,  76,  83,  85,  89,  92,  94,  98, 101, 110

241st through 250th magnanimous numbers:
17992, 19972, 20209, 20261, 20861, 22061, 22201, 22801, 22885, 24407

391st through 400th magnanimous numbers:
486685, 488489, 515116, 533176, 551558, 559952, 595592, 595598, 600881, 602081

F#[edit]

The function[edit]

This task uses Extensible Prime Generator (F#)

 
// Generate Magnanimous numbers. Nigel Galloway: March 20th., 2020
let rec fN n g = match (g/n,g%n) with
(0,_) -> true
|(α,β) when isPrime (α+β) -> fN (n*10) g
|_ -> false
let Magnanimous = let Magnanimous = fN 10 in seq{yield! {0..9}; yield! Seq.initInfinite id |> Seq.skip 10 |> Seq.filter Magnanimous}
 

The Tasks[edit]

First 45
 
Magnanimous |> Seq.take 45 |> Seq.iter (printf "%d "); printfn ""
 
Output:
0 1 2 3 4 5 6 7 8 9 11 12 14 16 20 21 23 25 29 30 32 34 38 41 43 47 49 50 52 56 58 61 65 67 70 74 76 83 85 89 92 94 98 101 110
Magnanimous[241] to Magnanimous[250]
 
Magnanimous |> Seq.skip 240 |> Seq.take 10 |> Seq.iter (printf "%d "); printfn "";;
 
Output:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407
Magnanimous[391] to Magnanimous[400]
 
Magnanimous |> Seq.skip 390 |> Seq.take 10 |> Seq.iter (printf "%d "); printfn "";;
 
Output:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

Factor[edit]

Translation of: Julia
Works with: Factor version 0.99 2020-01-23
USING: grouping io kernel lists lists.lazy math math.functions
math.primes math.ranges prettyprint sequences ;
 
: magnanimous? ( n -- ? )
dup 10 < [ drop t ] [
dup log10 >integer [1,b] [ 10^ /mod + prime? not ] with
find nip >boolean not
] if ;
 
: magnanimous ( n -- seq )
0 lfrom [ magnanimous? ] lfilter ltake list>array ;
 
: show ( seq from to -- ) rot subseq 15 group simple-table. nl ;
 
400 magnanimous
[ "First 45 magnanimous numbers" print 0 45 show ]
[ "241st through 250th magnanimous numbers" print 240 250 show ]
[ "391st through 400th magnanimous numbers" print 390 400 show ]
tri
Output:
First 45 magnanimous numbers
0  1  2  3  4  5  6  7  8  9  11 12 14 16  20
21 23 25 29 30 32 34 38 41 43 47 49 50 52  56
58 61 65 67 70 74 76 83 85 89 92 94 98 101 110

241st through 250th magnanimous numbers
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407

391st through 400th magnanimous numbers
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

Go[edit]

package main
 
import "fmt"
 
// OK for 'small' numbers.
func isPrime(n uint64) bool {
switch {
case n < 2:
return false
case n%2 == 0:
return n == 2
case n%3 == 0:
return n == 3
default:
d := uint64(5)
for d*d <= n {
if n%d == 0 {
return false
}
d += 2
if n%d == 0 {
return false
}
d += 4
}
return true
}
}
 
func ord(n int) string {
m := n % 100
if m >= 4 && m <= 20 {
return fmt.Sprintf("%dth", n)
}
m %= 10
suffix := "th"
if m < 4 {
switch m {
case 1:
suffix = "st"
case 2:
suffix = "nd"
case 3:
suffix = "rd"
}
}
return fmt.Sprintf("%d%s", n, suffix)
}
 
func isMagnanimous(n uint64) bool {
if n < 10 {
return true
}
for p := uint64(10); ; p *= 10 {
q := n / p
r := n % p
if !isPrime(q + r) {
return false
}
if q < 10 {
break
}
}
return true
}
 
func listMags(from, thru, digs, perLine int) {
if from < 2 {
fmt.Println("\nFirst", thru, "magnanimous numbers:")
} else {
fmt.Printf("\n%s through %s magnanimous numbers:\n", ord(from), ord(thru))
}
for i, c := uint64(0), 0; c < thru; i++ {
if isMagnanimous(i) {
c++
if c >= from {
fmt.Printf("%*d ", digs, i)
if c%perLine == 0 {
fmt.Println()
}
}
}
}
}
 
func main() {
listMags(1, 45, 3, 15)
listMags(241, 250, 1, 10)
listMags(391, 400, 1, 10)
}
Output:
First 45 magnanimous numbers:
  0   1   2   3   4   5   6   7   8   9  11  12  14  16  20 
 21  23  25  29  30  32  34  38  41  43  47  49  50  52  56 
 58  61  65  67  70  74  76  83  85  89  92  94  98 101 110 

241st through 250th magnanimous numbers:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407 

391st through 400th magnanimous numbers:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081 

Java[edit]

 
import java.util.ArrayList;
import java.util.List;
 
public class MagnanimousNumbers {
 
public static void main(String[] args) {
runTask("Find and display the first 45 magnanimous numbers.", 1, 45);
runTask("241st through 250th magnanimous numbers.", 241, 250);
runTask("391st through 400th magnanimous numbers.", 391, 400);
}
 
private static void runTask(String message, int startN, int endN) {
int count = 0;
List<Integer> nums = new ArrayList<>();
for ( int n = 0 ; count < endN ; n++ ) {
if ( isMagnanimous(n) ) {
nums.add(n);
count++;
}
}
System.out.printf("%s%n", message);
System.out.printf("%s%n%n", nums.subList(startN-1, endN));
}
 
private static boolean isMagnanimous(long n) {
if ( n >= 0 && n <= 9 ) {
return true;
}
long q = 11;
for ( long div = 10 ; q >= 10 ; div *= 10 ) {
q = n / div;
long r = n % div;
if ( ! isPrime(q+r) ) {
return false;
}
}
return true;
}
 
private static final int MAX = 100_000;
private static final boolean[] primes = new boolean[MAX];
private static boolean SIEVE_COMPLETE = false;
 
private static final boolean isPrimeTrivial(long test) {
if ( ! SIEVE_COMPLETE ) {
sieve();
SIEVE_COMPLETE = true;
}
return primes[(int) test];
}
 
private static final void sieve() {
// primes
for ( int i = 2 ; i < MAX ; i++ ) {
primes[i] = true;
}
for ( int i = 2 ; i < MAX ; i++ ) {
if ( primes[i] ) {
for ( int j = 2*i ; j < MAX ; j += i ) {
primes[j] = false;
}
}
}
}
 
// See http://primes.utm.edu/glossary/page.php?sort=StrongPRP
public static final boolean isPrime(long testValue) {
if ( testValue == 2 ) return true;
if ( testValue % 2 == 0 ) return false;
if ( testValue <= MAX ) return isPrimeTrivial(testValue);
long d = testValue-1;
int s = 0;
while ( d % 2 == 0 ) {
s += 1;
d /= 2;
}
if ( testValue < 1373565L ) {
if ( ! aSrp(2, s, d, testValue) ) {
return false;
}
if ( ! aSrp(3, s, d, testValue) ) {
return false;
}
return true;
}
if ( testValue < 4759123141L ) {
if ( ! aSrp(2, s, d, testValue) ) {
return false;
}
if ( ! aSrp(7, s, d, testValue) ) {
return false;
}
if ( ! aSrp(61, s, d, testValue) ) {
return false;
}
return true;
}
if ( testValue < 10000000000000000L ) {
if ( ! aSrp(3, s, d, testValue) ) {
return false;
}
if ( ! aSrp(24251, s, d, testValue) ) {
return false;
}
return true;
}
// Try 5 "random" primes
if ( ! aSrp(37, s, d, testValue) ) {
return false;
}
if ( ! aSrp(47, s, d, testValue) ) {
return false;
}
if ( ! aSrp(61, s, d, testValue) ) {
return false;
}
if ( ! aSrp(73, s, d, testValue) ) {
return false;
}
if ( ! aSrp(83, s, d, testValue) ) {
return false;
}
//throw new RuntimeException("ERROR isPrime: Value too large = "+testValue);
return true;
}
 
private static final boolean aSrp(int a, int s, long d, long n) {
long modPow = modPow(a, d, n);
//System.out.println("a = "+a+", s = "+s+", d = "+d+", n = "+n+", modpow = "+modPow);
if ( modPow == 1 ) {
return true;
}
int twoExpR = 1;
for ( int r = 0 ; r < s ; r++ ) {
if ( modPow(modPow, twoExpR, n) == n-1 ) {
return true;
}
twoExpR *= 2;
}
return false;
}
 
private static final long SQRT = (long) Math.sqrt(Long.MAX_VALUE);
 
public static final long modPow(long base, long exponent, long modulus) {
long result = 1;
while ( exponent > 0 ) {
if ( exponent % 2 == 1 ) {
if ( result > SQRT || base > SQRT ) {
result = multiply(result, base, modulus);
}
else {
result = (result * base) % modulus;
}
}
exponent >>= 1;
if ( base > SQRT ) {
base = multiply(base, base, modulus);
}
else {
base = (base * base) % modulus;
}
}
return result;
}
 
 
// Result is a*b % mod, without overflow.
public static final long multiply(long a, long b, long modulus) {
long x = 0;
long y = a % modulus;
long t;
while ( b > 0 ) {
if ( b % 2 == 1 ) {
t = x + y;
x = (t > modulus ? t-modulus : t);
}
t = y << 1;
y = (t > modulus ? t-modulus : t);
b >>= 1;
}
return x % modulus;
}
 
}
 
Output:
Find and display the first 45 magnanimous numbers.
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 14, 16, 20, 21, 23, 25, 29, 30, 32, 34, 38, 41, 43, 47, 49, 50, 52, 56, 58, 61, 65, 67, 70, 74, 76, 83, 85, 89, 92, 94, 98, 101, 110]

241st through 250th magnanimous numbers.
[17992, 19972, 20209, 20261, 20861, 22061, 22201, 22801, 22885, 24407]

391st through 400th magnanimous numbers.
[486685, 488489, 515116, 533176, 551558, 559952, 595592, 595598, 600881, 602081]

J[edit]

   write_sum_expressions=: ([: }: ]\) ,"1 '+' ,"1 ([: }. ]\.)   NB. combine prefixes with suffixes
   interstitial_sums=: "[email protected][email protected]":
   primeQ=: 1&p:
   magnanimousQ=: 1:`([: *./ [: primeQ interstitial_sums)@.(>&9)
   A=: (#~ magnanimousQ&>) i.1000000       NB. filter 1000000 integers
   #A
434

   strange=: ({. + [: i. -~/)@:(_1 0&+) NB. produce index ranges for output
   I=: _2 <@strange\ 1 45 241 250 391 400
   I (":@:{~ >)~"0 _ A
0 1 2 3 4 5 6 7 8 9 11 12 14 16 20 21 23 25 29 30 32 34 38 41 43 47 49 50 52 56 58 61 65 67 70 74 76 83 85 89 92 94 98 101 110
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407                                                                   
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081                                                         

Julia[edit]

using Primes
 
function ismagnanimous(n)
n < 10 && return true
for i in 1:ndigits(n)-1
q, r = divrem(n, 10^i)
 !isprime(q + r) && return false
end
return true
end
 
function magnanimous(N)
mvec, i = Int[], 0
while length(mvec) < N
if ismagnanimous(i)
push!(mvec, i)
end
i += 1
end
return mvec
end
 
const mag400 = magnanimous(400)
println("First 45 magnanimous numbers:\n", mag400[1:24], "\n", mag400[25:45])
println("\n241st through 250th magnanimous numbers:\n", mag400[241:250])
println("\n391st through 400th magnanimous numbers:\n", mag400[391:400])
 
Output:
First 45 magnanimous numbers:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 14, 16, 20, 21, 23, 25, 29, 30, 32, 34, 38, 41]
[43, 47, 49, 50, 52, 56, 58, 61, 65, 67, 70, 74, 76, 83, 85, 89, 92, 94, 98, 101, 110]

241st through 250th magnanimous numbers:
[17992, 19972, 20209, 20261, 20861, 22061, 22201, 22801, 22885, 24407]

391st through 400th magnanimous numbers:
[486685, 488489, 515116, 533176, 551558, 559952, 595592, 595598, 600881, 602081]

Nim[edit]

func isPrime(n: Natural): bool =
if n < 2: return
if n mod 2 == 0: return n == 2
if n mod 3 == 0: return n == 3
var d = 5
while d * d <= n:
if n mod d == 0: return false
inc d, 2
if n mod d == 0: return false
inc d, 4
return true
 
 
func isMagnanimous(n: Natural): bool =
var p = 10
while true:
let a = n div p
let b = n mod p
if a == 0: break
if not isPrime(a + b): return false
p *= 10
return true
 
 
iterator magnanimous(): (int, int) =
var n, count = 0
while true:
if n.isMagnanimous:
inc count
yield (count, n)
inc n
 
 
for (i, n) in magnanimous():
if i in 1..45:
if i == 1: stdout.write "First 45 magnanimous numbers:\n "
stdout.write n, if i == 45: '\n' else: ' '
 
elif i in 241..250:
if i == 241: stdout.write "\n241st through 250th magnanimous numbers:\n "
stdout.write n, if i == 250: "\n" else: " "
 
elif i in 391..400:
if i == 391: stdout.write "\n391st through 400th magnanimous numbers:\n "
stdout.write n, if i == 400: "\n" else: " "
 
elif i > 400:
break
Output:
First 45 magnanimous numbers:
  0 1 2 3 4 5 6 7 8 9 11 12 14 16 20 21 23 25 29 30 32 34 38 41 43 47 49 50 52 56 58 61 65 67 70 74 76 83 85 89 92 94 98 101 110

241st through 250th magnanimous numbers:
  17992  19972  20209  20261  20861  22061  22201  22801  22885  24407

391st through 400th magnanimous numbers:
  486685  488489  515116  533176  551558  559952  595592  595598  600881  602081

Perl[edit]

Translation of: Raku
Library: ntheory
use strict;
use warnings;
use feature 'say';
use ntheory 'is_prime';
 
sub magnanimous {
my($n) = @_;
my $last;
for my $c (1 .. length($n) - 1) {
++$last and last unless is_prime substr($n,0,$c) + substr($n,$c)
}
not $last;
}
 
my @M;
for ( my $i = 0, my $count = 0; $count < 400; $i++ ) {
++$count and push @M, $i if magnanimous($i);
}
 
say "First 45 magnanimous numbers\n".
(sprintf "@{['%4d' x 45]}", @M[0..45-1]) =~ s/(.{60})/$1\n/gr;
 
say "241st through 250th magnanimous numbers\n" .
join ' ', @M[240..249];
 
say "\n391st through 400th magnanimous numbers\n".
join ' ', @M[390..399];
Output:
First 45 magnanimous numbers
   0   1   2   3   4   5   6   7   8   9  11  12  14  16  20
  21  23  25  29  30  32  34  38  41  43  47  49  50  52  56
  58  61  65  67  70  74  76  83  85  89  92  94  98 101 110

241st through 250th magnanimous numbers
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407

391st through 400th magnanimous numbers
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

Phix[edit]

with javascript_semantics 
function magnanimous(integer n)
    integer p = 1, r = 0
    while n>=10 do
        r += remainder(n,10)*p
        n = floor(n/10)
        if not is_prime(n+r) then return false end if
        p *= 10
    end while
    return true
end function
 
sequence mag = {}
integer n = 0
while length(mag)<400 do
    if magnanimous(n) then mag &= n end if
    n += 1
end while
puts(1,"First 45 magnanimous numbers: ") pp(mag[1..45],{pp_Indent,30,pp_IntCh,false,pp_Maxlen,100})
printf(1,"magnanimous numbers[241..250]: %v\n", {mag[241..250]})
printf(1,"magnanimous numbers[391..400]: %v\n", {mag[391..400]})
Output:
First 45 magnanimous numbers: {0,1,2,3,4,5,6,7,8,9,11,12,14,16,20,21,23,25,29,30,32,34,38,41,43,
                               47,49,50,52,56,58,61,65,67,70,74,76,83,85,89,92,94,98,101,110}
magnanimous numbers[241..250]: {17992,19972,20209,20261,20861,22061,22201,22801,22885,24407}
magnanimous numbers[391..400]: {486685,488489,515116,533176,551558,559952,595592,595598,600881,602081}

PL/M[edit]

This sample can be compiled with the original 8080 PL/M compiler and run under CP/M (or a clone/emulator).
THe original 8080 PL/M only supports 8 and 16 bit quantities, so this only shows magnanimous numbers up to the 250th.

100H: /* FIND SOME MAGNANIMOUS NUMBERS - THOSE WHERE INSERTING '+' BETWEEN  */
/* ANY TWO OF THE DIGITS AND EVALUATING THE SUM RESULTS IN A PRIME */
BDOS: PROCEDURE( FN, ARG ); /* CP/M BDOS SYSTEM CALL */
DECLARE FN BYTE, ARG ADDRESS;
GOTO 5;
END BDOS;
PRINT$CHAR: PROCEDURE( C ); DECLARE C BYTE; CALL BDOS( 2, C ); END;
PRINT$STRING: PROCEDURE( S ); DECLARE S ADDRESS; CALL BDOS( 9, S ); END;
PRINT$NL: PROCEDURE; CALL PRINT$STRING( .( 0DH, 0AH, '$' ) ); END;
PRINT$NUMBER: PROCEDURE( N );
DECLARE N ADDRESS;
DECLARE V ADDRESS, N$STR( 6 ) BYTE, W BYTE;
V = N;
W = LAST( N$STR );
N$STR( W ) = '$';
N$STR( W := W - 1 ) = '0' + ( V MOD 10 );
DO WHILE( ( V := V / 10 ) > 0 );
N$STR( W := W - 1 ) = '0' + ( V MOD 10 );
END;
IF N < 100 THEN DO;
IF N < 10 THEN CALL PRINT$CHAR( ' ' );
CALL PRINT$CHAR( ' ' );
END;
CALL PRINT$STRING( .N$STR( W ) );
END PRINT$NUMBER;
/* INTEGER SQUARE ROOT: BASED ON THE ONE IN THE PL/M FROBENIUS NUMBERS */
SQRT: PROCEDURE( N )ADDRESS;
DECLARE ( N, X0, X1 ) ADDRESS;
IF N <= 3 THEN DO;
IF N = 0 THEN X0 = 0; ELSE X0 = 1;
END;
ELSE DO;
X0 = SHR( N, 1 );
DO WHILE( ( X1 := SHR( X0 + ( N / X0 ), 1 ) ) < X0 );
X0 = X1;
END;
END;
RETURN X0;
END SQRT;
 
DECLARE MAGNANIMOUS (251)ADDRESS; /* MAGNANIMOUS NUMBERS */
DECLARE FALSE LITERALLY '0';
DECLARE TRUE LITERALLY '0FFH';
/* TO FIND MAGNANIMOUS NUMBERS UP TO 30$000, WE NEED TO FIND PRIMES */
/* UP TO 9$999 + 9 = 10$008 */
DECLARE MAX$PRIME LITERALLY '10$008';
DECLARE DCL$PRIME LITERALLY '10$009';
/* SIEVE THE PRIMES TO MAX$PRIME */
DECLARE ( I, S ) ADDRESS;
DECLARE PRIME ( DCL$PRIME )BYTE;
PRIME( 1 ) = FALSE; PRIME( 2 ) = TRUE;
DO I = 3 TO LAST( PRIME ) BY 2; PRIME( I ) = TRUE; END;
DO I = 4 TO LAST( PRIME ) BY 2; PRIME( I ) = FALSE; END;
DO I = 3 TO SQRT( MAX$PRIME );
IF PRIME( I ) THEN DO;
DO S = I * I TO LAST( PRIME ) BY I + I;PRIME( S ) = FALSE; END;
END;
END;
 
/* FIND THE MAGNANIMOUS NUMBERS */
FIND$MAGNANIMOUS: PROCEDURE;
DECLARE ( D1, D2, D3, D4, D5
, D12, D123, D1234
, D23, D234, D2345
, D34, D345, D45
) ADDRESS;
DECLARE M$COUNT ADDRESS; /* COUNT OF MAGNANIMOUS NUMBERS FOUND */
STORE$MAGNANIMOUS: PROCEDURE( N )BYTE;
DECLARE N ADDRESS;
M$COUNT = M$COUNT + 1;
IF M$COUNT <= LAST( MAGNANIMOUS ) THEN MAGNANIMOUS( M$COUNT ) = N;
RETURN M$COUNT <= LAST( MAGNANIMOUS );
END STORE$MAGNANIMOUS;
 
M$COUNT = 0;
/* 1 DIGIT MAGNANIMOUS NUMBERS */
DO D1 = 0 TO 9; IF NOT STORE$MAGNANIMOUS( D1 ) THEN RETURN; END;
/* 2 DIGIT MAGNANIMOUS NUMBERS */
DO D1 = 1 TO 9;
DO D2 = 0 TO 9;
IF PRIME( D1 + D2 ) THEN DO;
IF NOT STORE$MAGNANIMOUS( ( D1 * 10 ) + D2 ) THEN RETURN;
END;
END;
END;
/* 3 DIGIT MAGNANIMOUS NUMBERS */
DO D1 = 1 TO 9;
DO D23 = 0 TO 99;
IF PRIME( D1 + D23 ) THEN DO;
D3 = D23 MOD 10;
D12 = ( D1 * 10 ) + ( D23 / 10 );
IF PRIME( D12 + D3 ) THEN DO;
IF NOT STORE$MAGNANIMOUS( ( D12 * 10 ) + D3 ) THEN RETURN;
END;
END;
END;
END;
/* 4 DIGIT MAGNANIMOUS NUMBERS */
DO D12 = 10 TO 99;
DO D34 = 0 TO 99;
IF PRIME( D12 + D34 ) THEN DO;
D123 = ( D12 * 10 ) + ( D34 / 10 );
D4 = D34 MOD 10;
IF PRIME( D123 + D4 ) THEN DO;
D1 = D12 / 10;
D234 = ( ( D12 MOD 10 ) * 100 ) + D34;
IF PRIME( D1 + D234 ) THEN DO;
IF NOT STORE$MAGNANIMOUS( ( D12 * 100 ) + D34 )
THEN RETURN;
END;
END;
END;
END;
END;
/* 5 DIGIT MAGNANIMOUS NUMBERS UP TO 30$000 */
DO D12 = 10 TO 30;
DO D345 = 0 TO 999;
IF PRIME( D12 + D345 ) THEN DO;
D123 = ( D12 * 10 ) + ( D345 / 100 );
D45 = D345 MOD 100;
IF PRIME( D123 + D45 ) THEN DO;
D1234 = ( D123 * 10 ) + ( D45 / 10 );
D5 = D45 MOD 10;
IF PRIME( D1234 + D5 ) THEN DO;
D1 = D12 / 10;
D2345 = ( ( D12 MOD 10 ) * 1000 ) + D345;
IF PRIME( D1 + D2345 ) THEN DO;
IF NOT STORE$MAGNANIMOUS( ( D12 * 1000 ) + D345 )
THEN RETURN;
END;
END;
END;
END;
END;
END;
END FIND$MAGNANIMOUS ;
 
CALL FIND$MAGNANIMOUS;
DO I = 1 TO LAST( MAGNANIMOUS );
IF I = 1 THEN DO;
CALL PRINT$STRING( .'MAGNANIMOUS NUMBERS 1-45:$' ); CALL PRINT$NL;
CALL PRINT$NUMBER( MAGNANIMOUS( I ) );
END;
ELSE IF I < 46 THEN DO;
IF I MOD 15 = 1 THEN CALL PRINT$NL; ELSE CALL PRINT$CHAR( ' ' );
CALL PRINT$NUMBER( MAGNANIMOUS( I ) );
END;
ELSE IF I = 241 THEN DO;
CALL PRINT$NL;
CALL PRINT$STRING( .'MAGANIMOUS NUMBERS 241-250:$' ); CALL PRINT$NL;
CALL PRINT$NUMBER( MAGNANIMOUS( I ) );
END;
ELSE IF I > 241 AND I <= 250 THEN DO;
CALL PRINT$CHAR( ' ' );
CALL PRINT$NUMBER( MAGNANIMOUS( I ) );
END;
END;
CALL PRINT$NL;
EOF
Output:
MAGNANIMOUS NUMBERS 1-45:
  0   1   2   3   4   5   6   7   8   9  11  12  14  16  20
 21  23  25  29  30  32  34  38  41  43  47  49  50  52  56
 58  61  65  67  70  74  76  83  85  89  92  94  98 101 110
MAGANIMOUS NUMBERS 241-250:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407

Raku[edit]

Works with: Rakudo version 2020.02
my @magnanimous = lazy flat ^10, (10 .. 1001).map( {
my int $last;
(1 ..^ .chars).map: -> \c { $last = 1 and last unless (.substr(0,c) + .substr(c)).is-prime }
next if $last;
$_
} ),
 
(1002 ..).map: {
# optimization for numbers > 1001; First and last digit can not both be even or both be odd
next if (.substr(0,1) + .substr(*-1)) %% 2;
my int $last;
(1 ..^ .chars).map: -> \c { $last = 1 and last unless (.substr(0,c) + .substr(c)).is-prime }
next if $last;
$_
}
 
put 'First 45 magnanimous numbers';
put @magnanimous[^45]».fmt('%3d').batch(15).join: "\n";
 
put "\n241st through 250th magnanimous numbers";
put @magnanimous[240..249];
 
put "\n391st through 400th magnanimous numbers";
put @magnanimous[390..399];
Output:
First 45 magnanimous numbers
  0   1   2   3   4   5   6   7   8   9  11  12  14  16  20
 21  23  25  29  30  32  34  38  41  43  47  49  50  52  56
 58  61  65  67  70  74  76  83  85  89  92  94  98 101 110

241st through 250th magnanimous numbers
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407

391st through 400th magnanimous numbers
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

REXX[edit]

The majority of the time consumed was in generating a list (sparse array) of suitable primes.
The genP subroutine could use a lot of optimization if wanted.
The magna function (magnanimous) was quite simple to code and pretty fast, it includes the 1st and last digit parity test.
By far, the most CPU time was in the generation of primes.

/*REXX pgm finds/displays magnanimous #s  (#s with a inserted + sign to sum to a prime).*/
parse arg bet.1 bet.2 bet.3 highP . /*obtain optional arguments from the CL*/
if bet.1=='' | bet.1=="," then bet.1= 1..45 /* " " " " " " */
if bet.2=='' | bet.2=="," then bet.2= 241..250 /* " " " " " " */
if bet.3=='' | bet.3=="," then bet.3= 391..400 /* " " " " " " */
if highP=='' | highP=="," then highP= 1000000 /* " " " " " " */
call genP /*gen primes up to highP (1 million).*/
 
do j=1 for 3 /*process three magnanimous "ranges". */
parse var bet.j LO '..' HI /*obtain the first range (if any). */
if HI=='' then HI= LO /*Just a single number? Then use LO. */
if HI==0 then iterate /*Is HI a zero? Then skip this range.*/
#= 0; $= /*#: magnanimous # cnt; $: is a list*/
do k=0 until #==HI /* [↓] traipse through the number(s). */
if \magna(k) then iterate /*Not magnanimous? Then skip this num.*/
#= # + 1 /*bump the magnanimous number count. */
if #>=LO then $= $ k /*In range► Then add number ──► $ list*/
end /*k*/
say
say center(' 'LO "──►" HI 'magnanimous numbers ', 126, "─")
say strip($)
end /*j*/
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
magna: procedure expose @. !.; parse arg x 1 L 2 '' -1 R /*obtain #, 1st & last digit.*/
len= length(x); if len==1 then return 1 /*one digit #s are magnanimous*/
if x>1001 then if L//2 == R//2 then return 0 /*Has parity? Not magnanimous*/
do s= 1 for len-1 /*traipse thru #, inserting + */
parse var x y +(s) z; sum= y + z /*parse 2 parts of #, sum 'em.*/
if !.sum then iterate /*Is sum prime? So far so good*/
else return 0 /*Nope? Then not magnanimous.*/
end /*s*/
return 1 /*Pass all the tests, it's magnanimous.*/
/*──────────────────────────────────────────────────────────────────────────────────────*/
genP: @.1=2; @.2=3; @.3=5; @.4=7; @.5=11; @.6= 13; nP=6 /*assign low primes; # primes.*/
 !.= 0; !.2=1; !.3=1; !.5=1; !.7=1; !.11=1; !.13=1 /*assign primality to numbers.*/
do [email protected].nP+4 by 2 to highP /*only find odd primes from here on. */
parse var j '' -1 _;if _==5 then iterate /*Is last digit a "5"? Then not prime*/
if j// 3==0 then iterate /*is J divisible by 3? " " " */
if j// 7==0 then iterate /* " " " " 7? " " " */
if j//11==0 then iterate /* " " " " 11? " " " */
if j//13==0 then iterate /* " " " " 13? " " " */
do k=7 while k*k<=j /*divide by some generated odd primes. */
if j // @.k==0 then iterate j /*Is J divisible by P? Then not prime*/
end /*k*/ /* [↓] a prime (J) has been found. */
nP= nP+1;  !.j= 1; @.nP= j /*bump P cnt; assign P to @. and  !. */
end /*j*/; return
output   when using the default inputs:
──────────────────────────────────────────────── 1 ──► 45 magnanimous numbers ────────────────────────────────────────────────
0 1 2 3 4 5 6 7 8 9 11 12 14 16 20 21 23 25 29 30 32 34 38 41 43 47 49 50 52 56 58 61 65 67 70 74 76 83 85 89 92 94 98 101 110
and took 0.00 seconds.


────────────────────────────────────────────── 241 ──► 250 magnanimous numbers ───────────────────────────────────────────────
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407
and took 0.31 seconds.


────────────────────────────────────────────── 391 ──► 400 magnanimous numbers ───────────────────────────────────────────────
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

Ring[edit]

 
load "stdlib.ring"
n = -1
sum = 0
magn = []
 
while sum < 45
n = n + 1
if n < 10
add(magn,n)
sum = sum + 1
else
nStr = string(n)
check = 0
for m = 1 to len(nStr)-1
nr1 = number(left(nStr,m))
nr2 = number(right(nStr,len(nStr)-m))
nr3 = nr1 + nr2
if not isprime(nr3)
check = 1
ok
next
if check = 0
add(magn,n)
sum = sum + 1
ok
ok
end
 
see "Magnanimous numbers 1-45:" + nl
showArray(magn)
 
n = -1
sum = 0
magn = []
 
while sum < 250
n = n + 1
if n < 10
sum = sum + 1
else
nStr = string(n)
check = 0
for m = 1 to len(nStr)-1
nr1 = number(left(nStr,m))
nr2 = number(right(nStr,len(nStr)-m))
nr3 = nr1 + nr2
if not isprime(nr3)
check = 1
ok
next
if check = 0
sum = sum + 1
ok
if check = 0 and sum > 240 and sum < 251
add(magn,n)
ok
ok
end
 
see nl
see "Magnanimous numbers 241-250:" + nl
showArray(magn)
 
func showArray array
txt = ""
see "["
for n = 1 to len(array)
txt = txt + array[n] + ","
next
txt = left(txt,len(txt)-1)
txt = txt + "]"
see txt
 
Magnanimous numbers 1-45:
[0,1,2,3,4,5,6,7,8,9,11,12,14,16,20,21,23,25,29,30,32,34,38,41,43,47,49,50,52,56,58,61,65,67,70,74,76,83,85,89,92,94,98,101,110]

Magnanimous numbers 241-250:
[17992,19972,20209,20261,20861,22061,22201,22801,22885,24407]

Ruby[edit]

Translation of: Sidef
require "prime"
 
magnanimouses = Enumerator.new do |y|
(0..).each {|n| y << n if (1..n.digits.size-1).all? {|k| n.divmod(10**k).sum.prime?} }
end
 
puts "First 45 magnanimous numbers:"
puts magnanimouses.first(45).join(' ')
 
puts "\n241st through 250th magnanimous numbers:"
puts magnanimouses.first(250).last(10).join(' ')
 
puts "\n391st through 400th magnanimous numbers:"
puts magnanimouses.first(400).last(10).join(' ')
 
Output:
First 45 magnanimous numbers:
0 1 2 3 4 5 6 7 8 9 11 12 14 16 20 21 23 25 29 30 32 34 38 41 43 47 49 50 52 56 58 61 65 67 70 74 76 83 85 89 92 94 98 101 110

241st through 250th magnanimous numbers:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407

391st through 400th magnanimous numbers:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

Rust[edit]

fn is_prime(n: u32) -> bool {
if n < 2 {
return false;
}
if n % 2 == 0 {
return n == 2;
}
if n % 3 == 0 {
return n == 3;
}
let mut p = 5;
while p * p <= n {
if n % p == 0 {
return false;
}
p += 2;
if n % p == 0 {
return false;
}
p += 4;
}
true
}
 
fn is_magnanimous(n: u32) -> bool {
let mut p: u32 = 10;
while n >= p {
if !is_prime(n % p + n / p) {
return false;
}
p *= 10;
}
true
}
 
fn main() {
let mut m = (0..).filter(|x| is_magnanimous(*x)).take(400);
println!("First 45 magnanimous numbers:");
for (i, n) in m.by_ref().take(45).enumerate() {
if i > 0 && i % 15 == 0 {
println!();
}
print!("{:3} ", n);
}
println!("\n\n241st through 250th magnanimous numbers:");
for n in m.by_ref().skip(195).take(10) {
print!("{} ", n);
}
println!("\n\n391st through 400th magnanimous numbers:");
for n in m.by_ref().skip(140) {
print!("{} ", n);
}
println!();
}
Output:
First 45 magnanimous numbers:
  0   1   2   3   4   5   6   7   8   9  11  12  14  16  20 
 21  23  25  29  30  32  34  38  41  43  47  49  50  52  56 
 58  61  65  67  70  74  76  83  85  89  92  94  98 101 110 

241st through 250th magnanimous numbers:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407 

391st through 400th magnanimous numbers:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081 

Sidef[edit]

func is_magnanimous(n) {
1..n.ilog10 -> all {|k|
sum(divmod(n, k.ipow10)).is_prime
}
}
 
say "First 45 magnanimous numbers:"
say is_magnanimous.first(45).join(' ')
 
say "\n241st through 250th magnanimous numbers:"
say is_magnanimous.first(250).last(10).join(' ')
 
say "\n391st through 400th magnanimous numbers:"
say is_magnanimous.first(400).last(10).join(' ')
Output:
First 45 magnanimous numbers:
0 1 2 3 4 5 6 7 8 9 11 12 14 16 20 21 23 25 29 30 32 34 38 41 43 47 49 50 52 56 58 61 65 67 70 74 76 83 85 89 92 94 98 101 110

241st through 250th magnanimous numbers:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407

391st through 400th magnanimous numbers:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081

Swift[edit]

Translation of: Rust
import Foundation
 
func isPrime(_ n: Int) -> Bool {
if n < 2 {
return false
}
if n % 2 == 0 {
return n == 2
}
if n % 3 == 0 {
return n == 3
}
var p = 5
while p * p <= n {
if n % p == 0 {
return false
}
p += 2
if n % p == 0 {
return false
}
p += 4
}
return true
}
 
func isMagnanimous(_ n: Int) -> Bool {
var p = 10;
while n >= p {
if !isPrime(n % p + n / p) {
return false
}
p *= 10
}
return true
}
 
let m = (0...).lazy.filter{isMagnanimous($0)}.prefix(400);
print("First 45 magnanimous numbers:");
for (i, n) in m.prefix(45).enumerated() {
if i > 0 && i % 15 == 0 {
print()
}
print(String(format: "%3d", n), terminator: " ")
}
print("\n\n241st through 250th magnanimous numbers:");
for n in m.dropFirst(240).prefix(10) {
print(n, terminator: " ")
}
print("\n\n391st through 400th magnanimous numbers:");
for n in m.dropFirst(390) {
print(n, terminator: " ")
}
print()
Output:
First 45 magnanimous numbers:
  0   1   2   3   4   5   6   7   8   9  11  12  14  16  20 
 21  23  25  29  30  32  34  38  41  43  47  49  50  52  56 
 58  61  65  67  70  74  76  83  85  89  92  94  98 101 110 

241st through 250th magnanimous numbers:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407 

391st through 400th magnanimous numbers:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081 

Visual Basic .NET[edit]

Translation of: C#
Imports System, System.Console
 
Module Module1
 
Dim np As Boolean()
 
Sub ms(ByVal lmt As Long)
np = New Boolean(CInt(lmt)) {} : np(0) = True : np(1) = True
Dim n As Integer = 2, j As Integer = 1 : While n < lmt
If Not np(n) Then
Dim k As Long = CLng(n) * n
While k < lmt : np(CInt(k)) = True : k += n : End While
End If : n += j : j = 2 : End While
End Sub
 
Function is_Mag(ByVal n As Integer) As Boolean
Dim res, rm As Integer, p As Integer = 10
While n >= p
res = Math.DivRem(n, p, rm)
If np(res + rm) Then Return False
p = p * 10 : End While : Return True
End Function
 
Sub Main(ByVal args As String())
ms(100_009) : Dim mn As String = " magnanimous numbers:"
WriteLine("First 45{0}", mn) : Dim l As Integer = 0, c As Integer = 0
While c < 400 : If is_Mag(l) Then
c += 1 : If c <= 45 OrElse (c > 240 AndAlso c <= 250) OrElse c > 390 Then Write(If(c <= 45, "{0,4} ", "{0,8:n0} "), l)
If c < 45 AndAlso c Mod 15 = 0 Then WriteLine()
If c = 240 Then WriteLine(vbLf & vbLf & "241st through 250th{0}", mn)
If c = 390 Then WriteLine(vbLf & vbLf & "391st through 400th{0}", mn)
End If : l += 1 : End While
End Sub
End Module
Output:
First 45 magnanimous numbers:
   0    1    2    3    4    5    6    7    8    9   11   12   14   16   20 
  21   23   25   29   30   32   34   38   41   43   47   49   50   52   56 
  58   61   65   67   70   74   76   83   85   89   92   94   98  101  110 

241st through 250th magnanimous numbers:
  17,992   19,972   20,209   20,261   20,861   22,061   22,201   22,801   22,885   24,407 

391st through 400th magnanimous numbers:
 486,685  488,489  515,116  533,176  551,558  559,952  595,592  595,598  600,881  602,081 

Wren[edit]

Library: Wren-fmt
Library: Wren-math
Translation of: Go
import "/fmt" for Conv, Fmt
import "/math" for Int
 
var isMagnanimous = Fn.new { |n|
if (n < 10) return true
var p = 10
while (true) {
var q = (n/p).floor
var r = n % p
if (!Int.isPrime(q + r)) return false
if (q < 10) break
p = p * 10
}
return true
}
 
var listMags = Fn.new { |from, thru, digs, perLine|
if (from < 2) {
System.print("\nFirst %(thru) magnanimous numbers:")
} else {
System.print("\n%(Conv.ord(from)) through %(Conv.ord(thru)) magnanimous numbers:")
}
var i = 0
var c = 0
while (c < thru) {
if (isMagnanimous.call(i)) {
c = c + 1
if (c >= from) {
System.write(Fmt.d(digs, i) + " ")
if (c % perLine == 0) System.print()
}
}
i = i + 1
}
}
 
listMags.call(1, 45, 3, 15)
listMags.call(241, 250, 1, 10)
listMags.call(391, 400, 1, 10)
Output:
First 45 magnanimous numbers:
  0   1   2   3   4   5   6   7   8   9  11  12  14  16  20 
 21  23  25  29  30  32  34  38  41  43  47  49  50  52  56 
 58  61  65  67  70  74  76  83  85  89  92  94  98 101 110 

241st through 250th magnanimous numbers:
17992 19972 20209 20261 20861 22061 22201 22801 22885 24407 

391st through 400th magnanimous numbers:
486685 488489 515116 533176 551558 559952 595592 595598 600881 602081