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juliocesar/prime.rb

Forked from atnan/prime.rb
Created November 19, 2009 00:39
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prime.rb
class Integer
def prime?
!("1" * self).match(/^1?$|^(11+?)\1+$/).nil?
end
end
class DHHException < Exception; end
raise DHHException, 'Whoops!' if !1.prime?
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