Nice primes: Difference between revisions
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<lang julia>using Primes |
<lang julia>using Primes |
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isnice(n, base=10) = isprime(n) && mod1(n, base - 1) in [2, 3, 5, 7, 11, 13, 17, 19]) |
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function isnice(n, base=10) |
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pdroot(i) = (x = sum(digits(i, base=base)); x > 9 ? pdroot(x) : x in [2, 3, 5, 7]) |
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return isprime(n) && pdroot(n) |
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end |
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filter_open_interval(500, 1000, isnice) |
filter_open_interval(500, 1000, isnice) |
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