mersenneforum.org  

Go Back   mersenneforum.org > Factoring Projects > YAFU

Reply
 
Thread Tools
Old 2017-05-03, 16:55   #1
ils04
 
May 2017

1 Posts
Default Failure to factor a smallish number

I built yafu-1.34 from the source on openSUSE. When I try to factor(34!-1), the session hangs:

>> factor(34!-1)

fac: factoring 295232799039604140847618609643519999999
fac: using pretesting plan: normal
fac: no tune info: using qs/gnfs crossover of 95 digits

starting SIQS on c39: 295232799039604140847618609643519999999

==== sieving in progress (1 thread): 624 relations needed ====
==== Press ctrl-c to abort and save state ====

Any idea?

Thanks
ils04 is offline   Reply With Quote
Old 2017-05-03, 17:44   #2
bsquared
 
bsquared's Avatar
 
"Ben"
Feb 2007

25×3×5×7 Posts
Default

Quote:
Originally Posted by ils04 View Post
I built yafu-1.34 from the source on openSUSE. When I try to factor(34!-1), the session hangs:

>> factor(34!-1)

fac: factoring 295232799039604140847618609643519999999
fac: using pretesting plan: normal
fac: no tune info: using qs/gnfs crossover of 95 digits

starting SIQS on c39: 295232799039604140847618609643519999999

==== sieving in progress (1 thread): 624 relations needed ====
==== Press ctrl-c to abort and save state ====

Any idea?

Thanks
Can you post your build command (the make x86_64 ... line you used)? This seems to work fine for me but I use the USE_SSE41 flag during make so if you didn't maybe the problem is in the SSE2 code.
bsquared is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
smallish Mersenne Primes MattcAnderson Math 0 2017-06-28 11:27
Factor a 108-digit number sweety439 Factoring 9 2016-12-21 21:22
Number 59649589127497217 is a factor of Fermat number F7 literka Miscellaneous Math 73 2013-11-17 10:33
who can factor this 128 digits number? aaa120 Factoring 19 2010-09-04 09:16
Factor a number for me penguinman007 Soap Box 9 2005-08-20 19:42

All times are UTC. The time now is 15:53.

Sun Jan 17 15:53:29 UTC 2021 up 45 days, 12:04, 0 users, load averages: 2.48, 2.43, 2.40

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, 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.