Contributing to Cunningham Project - Page 22

Batalov · 2021-02-06, 22:00

I would suggest the low-hanging fruit of base-2 extensions. Those might yield some hits because SSW himself just pulled a p56, so there are some p5x factors in this set sans 3+ that are already done : https://homes.cerias.purdue.edu/~ssw/cun/xtend/up7.txt

But there is a good argument to continue hitting hard on Base-2 main, too. Three inch punch! It really worked for her in the end!

charybdis · 2021-02-19, 01:42

Quote:

Originally Posted by VBCurtis

EDIT2: ETA is just under 10 days, running on all 20 cores without MPI. I recently updated that machine to Ubuntu 20.04, so I may try to get the MPI fix applied and see how msieve-MPI performs on it.

It's been a few weeks. Guessing you put this on hold to work on something else?

VBCurtis · 2021-02-19, 02:19

Whoops! Sorry, I was so eager to jump on the quartic from the Cunningham extensions that I forgot to post factors when the matrix finished:

Code:

Sun Jan 31 00:34:01 2021  p82 factor: 8839572613855891331570438385350118192600962609702949549624218311059899144936218181
Sun Jan 31 00:34:01 2021  p109 factor: 3241497049926344989867894223963855082968056873457044230450152346084471878024227245959456141481343243331475641

Log attached.

charybdis · 2021-02-19, 02:26

Good job everyone! 20 days from start to finish isn't too shabby

Curtis, have you sent the factors to Sam Wagstaff?

VBCurtis · 2021-02-19, 02:56

Negative. First report anywhere is two posts up.

charybdis · 2021-02-19, 03:02

OK, might as well send them myself then...

2021-02-06, 22:00	#232
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 2²·2,333 Posts	I would suggest the low-hanging fruit of base-2 extensions. Those might yield some hits because SSW himself just pulled a p56, so there are some p5x factors in this set sans 3+ that are already done : https://homes.cerias.purdue.edu/~ssw/cun/xtend/up7.txt But there is a good argument to continue hitting hard on Base-2 main, too. Three inch punch! It really worked for her in the end! Attached Thumbnails

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cunningham ECM efforts	pinhodecarlos	Cunningham Tables	7	2017-12-21 13:29
Cunningham ECM Now Futile?	R.D. Silverman	GMP-ECM	4	2012-04-25 02:45
Cunningham Project on YouTube	Batalov	Cunningham Tables	0	2012-02-26 02:58
Extended Cunningham or so	rekcahx	Factoring	6	2011-08-19 12:45
Introduction: ECM work done on Cunningham Project composites	garo	Cunningham Tables	2	2005-01-20 10:06

2021-02-19, 02:26	#235
charybdis Apr 2020 193 Posts	Good job everyone! 20 days from start to finish isn't too shabby Curtis, have you sent the factors to Sam Wagstaff?

2021-02-19, 02:56	#236
VBCurtis "Curtis" Feb 2005 Riverside, CA 3×1,559 Posts	Negative. First report anywhere is two posts up.

2021-02-19, 03:02	#237
charybdis Apr 2020 193 Posts	OK, might as well send them myself then...