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Old 2011-08-03, 14:49   #9
CRGreathouse's Avatar
Aug 2006

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Originally Posted by LiquidNitrogen View Post
And now I actually know how to do the Lucas-Lehmer test, although those s(k) numbers grow too big for Excel after s(4). At least Excel can prove 2^5 - 1 is prime using Lucas-Lehmer
If you reduce mod the Mersenne number at each step, you can prove 2^19 - 1 prime in Excel.
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