Long primes: Difference between revisions
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% 8,564,024 inferences, 0.991 CPU in 1.040 seconds (95% CPU, 8641390 Lips)
true.
</pre>
=={{header|PureBasic}}==
<lang PureBasic>#MAX=64000
If OpenConsole()=0 : End 1 : EndIf
Dim p.b(#MAX) : FillMemory(@p(),#MAX,#True,#PB_Byte)
For n=2 To Int(Sqr(#MAX))+1 : If p(n) : m=n*n : While m<=#MAX : p(m)=#False : m+n : Wend : EndIf : Next
Procedure.i periodic(v.i)
r=1 : Repeat : r=(r*10)%v : c+1 : If r<=1 : ProcedureReturn c : EndIf : ForEver
EndProcedure
n=500
PrintN(LSet("_",15,"_")+"Long primes upto "+Str(n)+LSet("_",15,"_"))
For i=3 To 500 Step 2
If p(i) And (i-1)=periodic(i)
Print(RSet(Str(i),5)) : c+1 : If c%10=0 : PrintN("") : EndIf
EndIf
Next
PrintN(~"\n")
PrintN("The number of long primes up to:")
PrintN(RSet(Str(n),8)+" is "+Str(c)) : n+n
For i=501 To #MAX+1 Step 2
If p(i) And (i-1)=periodic(i) : c+1 : EndIf
If i>n : PrintN(RSet(Str(n),8)+" is "+Str(c)) : n+n : EndIf
Next
Input()</lang>
{{out}}
<pre>_______________Long primes upto 500_______________
7 17 19 23 29 47 59 61 97 109
113 131 149 167 179 181 193 223 229 233
257 263 269 313 337 367 379 383 389 419
433 461 487 491 499
The number of long primes up to:
500 is 35
1000 is 60
2000 is 116
4000 is 218
8000 is 390
16000 is 716
32000 is 1300
64000 is 2430
</pre>
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