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Old 2005-01-15, 19:19   #1
VJS
 
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Dec 2004

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Default How do I prove a 4000 digit number is prime??

I have one 31-digit factor from a number of the k*2^n+1 type where n=~7300,

How do I check if the "Co-factor" is prime, it ends in ....1162049124129

Thanks
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