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6 + 1, 6 + 66 + 1, 6*66 + 1 , 6 + 66 + 666 + 1 and 6*66*666 + 1 are all primes. [Firoozbakht]

 

  Submitted: 2003-11-20 07:37:42;   Last Modified: 2009-04-02 06:03:33.



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