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Old 2012-09-15, 03:31   #6
Prime95
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Aug 2002
Yeehaw, FL

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Quote:
Originally Posted by ET_ View Post
I just read this sentence: "In private correspondence with Chris K. Caldwell, I announced that C5 = 2(2[sup]127-1)[/sup]-1 has no prime factor < 5 * 1051."
Thats only 2^171.7. Ernst later went to about 2^175.5
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