Nice primes: Difference between revisions
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=={{header|Sidef}}==
<lang ruby>func digital_root(n, base=10) {
while (n.len(base) > 1) {
n = n.sumdigits(base)
}
return n
}
say primes(500, 1000).grep { digital_root(_).is_prime }</lang>
{{out}}
<pre>
[509, 547, 563, 569, 587, 599, 601, 617, 619, 641, 653, 659, 673, 677, 691, 709, 727, 743, 761, 797, 821, 839, 853, 857, 887, 907, 911, 929, 941, 947, 977, 983, 997]
</pre>
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