Created
August 21, 2010 19:42
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| # http://www.noulakaz.net/weblog/2007/03/18/a-regular-expression-to-check-for-prime-numbers/ | |
| def is_prime(n) | |
| ("1" * n) !~ /^1?$|^(11+?)\1+$/ | |
| end |
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