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Old 2009-01-06, 22:35   #6
Apprentice Crank
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Mar 2006

2×227 Posts

313*2^714999-1 is not prime. LLR Res64: 931897CCCCC047D5 Time : 847.984 sec.

First you've got the 999 in the exponent, then you've got the 5 C's in a row in the residue :surprised
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