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December 29, 2015 02:09
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| let is_prime n = | |
| match n with | |
| |n when n < 2 -> false | |
| |n when n = 2 || n = 3 -> true | |
| |n when n % 2 = 0 || n % 3 = 0 -> false | |
| |n -> | |
| let rec check i rootn n = | |
| if i > rootn then true | |
| else | |
| if n % i = 0 then false | |
| else check (i+1) rootn n | |
| check 5 (int (sqrt (float n))) n |
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