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The first known factor of F31 was discovered on April 12, 2001, by A. Kruppa using a sieving program developed by T. Forbes. (The Fermat numbers grow so fast that our only hope of showing them not prime is by finding a factor.)


  Submitted: 2001-04-14 08:30:44;   Last Modified: 2009-01-22 21:25:52.

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