mersenneforum.org  

Go Back   mersenneforum.org > Factoring Projects > Factoring

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

4810 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.
Shaopu Lin is offline   Reply With Quote
Old 2004-10-31, 11:34   #2
geoff
 
geoff's Avatar
 
Mar 2003
New Zealand

48516 Posts
Default

How long did it take?
geoff is offline   Reply With Quote
Old 2004-10-31, 13:48   #3
Shaopu Lin
 
Shaopu Lin's Avatar
 
Jul 2004

608 Posts
Default It took about a week.

This process took 8 days,including the time which this process paused.
Shaopu Lin is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
M361437143 - composite Madpoo Data 0 2016-03-10 02:25
is M21934219 composite ? S485122 Data 50 2011-01-10 10:28
S_N cycles in LL done on composite M(p) tichy Math 1 2010-12-23 16:47
The composite conjecture Carl Fischbach Miscellaneous Math 8 2010-07-02 08:03
Composite checkerboard Kees Puzzles 14 2007-11-20 15:16

All times are UTC. The time now is 18:09.

Sat Oct 24 18:09:58 UTC 2020 up 44 days, 15:20, 1 user, load averages: 1.83, 1.90, 1.90

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.