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Old 2011-08-03, 16:13   #12
wblipp
 
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"William"
May 2003
New Haven

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Quote:
Originally Posted by CRGreathouse View Post
If you reduce mod the Mersenne number at each step, you can prove 2^19 - 1 prime in Excel.
If you get the ZMath Addin, you can confirm 2^607-1 is prime in Excel. You can test up to 2^829-1.
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