mersenneforum.org F10,21=10^(2^21)+1 is composite
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 2004-10-30, 17:38 #1 Shaopu Lin     Jul 2004 24·3 Posts F10,21=10^(2^21)+1 is composite Today I proved that F10,21=10^(2^21)+1 is composite by Yves Gallot's Proth.exe on 2.80GHz P4 PC with Windows XP,it has 2097153 digits and it is the smallest Generalized Fermat number characteristic unknown. I hope that someone can check it again to prove that this thing is true.
 2004-10-31, 11:34 #2 geoff     Mar 2003 New Zealand 13·89 Posts How long did it take?
 2004-10-31, 13:48 #3 Shaopu Lin     Jul 2004 1100002 Posts It took about a week. This process took 8 days,including the time which this process paused.

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