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This number is a prime.
469 3163567786 4055013377
Single Curio View: (Seek other curios for this number)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 13:30:44; Last Modified: 2009-01-23 03:25:52.
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