Semiprime: Difference between revisions
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Faster version using 'factor' function from [U|Li]nux Core Utilities library. |
Faster version using 'factor' function from [U|Li]nux Core Utilities library. |
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<lang ruby>def semiprime(n) |
<lang ruby>def semiprime(n) |
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`factor #{n}`.split(' ') |
`factor #{n}`.split(' ').size == 3 |
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end |
end |
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n = 0xffffffffffffffff_u64 # 2**64 - 1 = 18446744073709551615 |
n = 0xffffffffffffffff_u64 # 2**64 - 1 = 18446744073709551615 |
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