Palindromic primes

Palindromic primes 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.

Task

Find and show all palindromic primes   n,     where   n   <   1000

Ring

<lang ring> load "stdlib.ring"

decimals(0) see "working..." + nl see "Palindromic primes are:" + nl

row = 0 limit = 1000

for n = 1 to limit

   strn = string(n)
   if ispalindrome(strn) and isprime(n)
      row = row + 1
      see "" + n + " "
      if row%5 = 0
         see nl
      ok
   ok

next

see "Found " + row + " palindromic primes" + nl see "done..." + nl </lang>

Output:

working...
Palindromic primes are:
2 3 5 7 11 
101 131 151 181 191 
313 353 373 383 727 
757 787 797 919 929 
Found 20 palindromic primes
done...