Nice primes: Difference between revisions
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</pre> |
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=={{header|Sidef}}== |
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<lang ruby>func digital_root(n, base=10) { |
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while (n.len(base) > 1) { |
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n = n.sumdigits(base) |
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} |
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return n |
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} |
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say primes(500, 1000).grep { digital_root(_).is_prime }</lang> |
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{{out}} |
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<pre> |
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[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] |
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</pre> |
</pre> |
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