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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

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