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Old 2004-10-30, 17:38   #1
Shaopu Lin
Shaopu Lin's Avatar
Jul 2004

24·3 Posts
Post 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.
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Old 2004-10-31, 11:34   #2
geoff's Avatar
Mar 2003
New Zealand

13×89 Posts

How long did it take?
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Old 2004-10-31, 13:48   #3
Shaopu Lin
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Jul 2004

24×3 Posts
Default It took about a week.

This process took 8 days,including the time which this process paused.
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