mersenneforum.org  

Go Back   mersenneforum.org > Factoring Projects > Aliquot Sequences

Reply
 
Thread Tools
Old 2014-04-11, 09:49   #144
swellman
 
swellman's Avatar
 
Jun 2012

B2A16 Posts
Default

I hit it with some ECM and it's now in GNFS (sieving). Should finish factoring Saturday night.
swellman is online now   Reply With Quote
Old 2014-04-12, 20:48   #145
swellman
 
swellman's Avatar
 
Jun 2012

2×1,429 Posts
Default

Now it's moved to a C132. Ran 900 curves at B1=1M with no factors found. Somebody take it.
swellman is online now   Reply With Quote
Old 2014-04-13, 08:48   #146
rajula
 
rajula's Avatar
 
"Tapio Rajala"
Feb 2010
Finland

32×5×7 Posts
Default

Quote:
Originally Posted by swellman View Post
Now it's moved to a C132. Ran 900 curves at B1=1M with no factors found. Somebody take it.
Code:
Using B1=4528314, B2=4528314-8562077170, polynomial Dickson(6), sigma=1:1590548922
Step 1 took 15496ms
Step 2 took 5996ms
********** Factor found in step 2: 20563314438829833994736809392823600171
Found probable prime factor of 38 digits: 20563314438829833994736809392823600171
Probable prime cofactor 5822471939999663653675700987632417753596924497311978679187997966823194528620642268179424639277 has 94 digits
rajula is offline   Reply With Quote
Old 2014-04-13, 19:46   #147
RichD
 
RichD's Avatar
 
Sep 2008
Kansas

22×3×7×37 Posts
Default C137 @ i2123

2^3 * 3^2 * ... * C137

~400 @ 11e6 found the p42.
RichD is offline   Reply With Quote
Old 2014-04-18, 15:51   #148
prgamma10
 
prgamma10's Avatar
 
Jan 2013

109 Posts
Default

Quote:
Originally Posted by RichD View Post
2^3 * 3^2 * ... * C137

~400 @ 11e6 found the p42.
I would take this C137.
prgamma10 is offline   Reply With Quote
Old 2014-04-20, 06:45   #149
prgamma10
 
prgamma10's Avatar
 
Jan 2013

109 Posts
Default C181 @ i2124

2^3 * 3^3 * ... * C181

2t40 done, no factor.
prgamma10 is offline   Reply With Quote
Old 2014-04-20, 07:48   #150
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

2×13×337 Posts
Default

Nice work all, with this sequence. Maybe it would be the time to abandon it, if ECM turns out fruitless? I mean, I was the guy who propose it and prop it in the beginning, but now I may be the guy to kill it
I mean, over C180, GNFS is not something easy anymore, and we can concentrate the efforts on pushing other sequences higher. Let this sleep for a while, and in few years we will have better tools (i.e. accessible to "normal" guys like me) to attack it at a cheaper cost (time and electricity). Not that it wouldn't be enough sequences under 120 digits to pick up from...

Last fiddled with by LaurV on 2014-04-20 at 07:49
LaurV is offline   Reply With Quote
Old 2014-04-20, 10:09   #151
prgamma10
 
prgamma10's Avatar
 
Jan 2013

1558 Posts
Default

Quote:
Originally Posted by LaurV View Post
Nice work all, with this sequence. Maybe it would be the time to abandon it, if ECM turns out fruitless? I mean, I was the guy who propose it and prop it in the beginning, but now I may be the guy to kill it
I mean, over C180, GNFS is not something easy anymore, and we can concentrate the efforts on pushing other sequences higher. Let this sleep for a while, and in few years we will have better tools (i.e. accessible to "normal" guys like me) to attack it at a cheaper cost (time and electricity). Not that it wouldn't be enough sequences under 120 digits to pick up from...
+1.

Sound reasonable to me.
prgamma10 is offline   Reply With Quote
Old 2014-04-22, 13:43   #152
prgamma10
 
prgamma10's Avatar
 
Jan 2013

109 Posts
Default

Quote:
Originally Posted by prgamma10 View Post
2^3 * 3^3 * ... * C181

2t40 done, no factor.
t45 done, no factor.
prgamma10 is offline   Reply With Quote
Old 2014-05-18, 11:04   #153
prgamma10
 
prgamma10's Avatar
 
Jan 2013

109 Posts
Default

Quote:
Originally Posted by prgamma10 View Post
t45 done, no factor.
t50 done, no factor.
prgamma10 is offline   Reply With Quote
Old 2014-09-18, 15:39   #154
henryzz
Just call me Henry
 
henryzz's Avatar
 
"David"
Sep 2007
Cambridge (GMT/BST)

2×2,861 Posts
Default

Everyone finished with this one? If so I will unsticky it.
henryzz is online now   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Primes in n-fibonacci sequence and n-step fibonacci sequence sweety439 And now for something completely different 17 2017-06-13 03:49
Team sieve #41: C165 from 3366:i2098 RichD Aliquot Sequences 36 2013-11-29 07:03
80M to 64 bits ... but not really reserved petrw1 Lone Mersenne Hunters 82 2010-01-11 01:57
What's the next in the sequence? roger Puzzles 16 2006-10-18 19:52
Sequence Citrix Puzzles 5 2005-09-14 23:33

All times are UTC. The time now is 17:24.

Thu Oct 1 17:24:08 UTC 2020 up 21 days, 14:35, 0 users, load averages: 1.49, 1.49, 1.57

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.