8 lines
200 B
Text
8 lines
200 B
Text
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1000.primes.map_reduce {|a,b| a + b }.map_kv {|k,v|
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[k+1, prime(k+1), v]
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}.grep { .tail.is_prime }.prepend(
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['count', 'prime', 'sum']
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).each_2d {|n,p,s|
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printf("%5s %6s %8s\n", n, p, s)
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}
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