Neighbour primes: Difference between revisions
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Found 20 neighbour primes
done...
</pre>
=={{header|Sidef}}==
<lang ruby>500.primes.grep {|p| p * p.next_prime + 2 -> is_prime }.say</lang>
{{out}}
<pre>
[3, 5, 7, 13, 19, 67, 149, 179, 229, 239, 241, 269, 277, 307, 313, 397, 401, 419, 439, 487]
</pre>
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