8 lines
177 B
Text
8 lines
177 B
Text
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func additive_primes(upto, base = 10) {
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upto.primes.grep { .sumdigits(base).is_prime }
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}
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additive_primes(500).each_slice(10, {|*a|
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a.map { '%3s' % _ }.join(' ').say
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})
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