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Ruby isPrime Method

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Nov 11th, 2011
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  1. ('1' * N) !~ /^1?$|^(11+?)1+$/
  2.  
  3. require 'mathn'
  4. 38749711234868463.prime?
  5. => false
  6.  
  7. /^(1+)1*=1+$/.match('1' * x + '=' + '1' * y)[1].length
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