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Sharon Rosner http://hiperu.blogspot.com

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Check for primality with a regexp

Original perl code here:

http://montreal.pm.org/tech/neil_kandalgaonkar.shtml

   1  
   2  class Fixnum
   3    def prime?
   4      ('1' * self) !~ /^1?$|^(11+?)\1+$/
   5    end
   6  end
to ruby regexp primality by ciconia on Mar 18, 2007 1 Comments
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