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In 1644, Mersenne wrote that 2^257 - 1 was prime. It took 283 years for Lehmer to prove him wrong; later, Penk and Baillie found its three prime factors. This is the smallest of those three.

 

  Submitted: 2003-12-20 02:44:15;   Last Modified: 2008-08-01 07:31:33.



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