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| ruby Discover if a number is prime http://www.noulakaz.net/weblog/2007/03/18/a-regular-expression-to-check-for-prime-numbers/ Source Article | |
| class Fixnum | |
| def prime? | |
| ('1' * self) !~ /^1?$|^(11+?)\1+$/ | |
| end | |
| end |
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