mersenneforum.org  

Go Back   mersenneforum.org > Factoring Projects > Aliquot Sequences

Reply
 
Thread Tools
Old 2021-03-29, 11:26   #1
bur
 
Aug 2020

2438 Posts
Default Does it make sense to participate casually?

Form what I read here it seems that most sequences are at a point where the factorization got so hard, that it's not just fed into yafu but rather a lot of thought is given and various tools are used.

Is it like that? Or is it possible to just have at it using yafu or similar software?
bur is offline   Reply With Quote
Old 2021-03-29, 12:19   #2
Happy5214
 
Happy5214's Avatar
 
"Alexander"
Nov 2008
The Alamo City

22×149 Posts
Default

Quote:
Originally Posted by bur View Post
Form what I read here it seems that most sequences are at a point where the factorization got so hard, that it's not just fed into yafu but rather a lot of thought is given and various tools are used.

Is it like that? Or is it possible to just have at it using yafu or similar software?
My primary desktop is a 2008-era Core 2, so I lack the patience to do cofactors larger than 120 digits unless it's a downdriver. There are still plenty of sequences in the 2M-3M starting value range that are small enough for even the oldest hardware or least patient crunchers. Find sequences at https://www.rechenkraft.net/aliquot/AllSeq.html, and use aliqueit (https://www.mersenneforum.org/showthread.php?t=11618), which can call yafu to do the actual work. You can also reserve a base in the ongoing integer power subproject.

Last fiddled with by Happy5214 on 2021-03-29 at 12:20
Happy5214 is offline   Reply With Quote
Old 2021-03-29, 16:20   #3
bur
 
Aug 2020

163 Posts
Default

Thanks, it seemed to me as if special knowledge which parameters to choose for ECM or NFS were required. But I guess that is only the case for stubborn "roadblock" type composites?
bur is offline   Reply With Quote
Old 2021-03-29, 16:43   #4
VBCurtis
 
VBCurtis's Avatar
 
"Curtis"
Feb 2005
Riverside, CA

10010101000112 Posts
Default

I am no YAFU expert, but I think it's fine for up to 150 digits or so without any special knowledge. If you decide you have a sequence you'd like to work on, and you get a composite in the 150-159 digit range, and you lack the computer power to run it yourself, you can send the job to the nfs@home 14d queue. That takes a little specialized knowledge, but I'll be happy to help you with that (whether "that" is "how do I pick settings to run it here?" or "how do I pick settings to send to nfs@home?")

If you run linux, you can use CADO to factor numbers as large as you have patience for, and it's usually faster than yafu. We've developed paramaters hand-tuned to make cado faster, see the CADO subforum for details.
VBCurtis is online now   Reply With Quote
Old 2021-03-30, 07:22   #5
henryzz
Just call me Henry
 
henryzz's Avatar
 
"David"
Sep 2007
Cambridge (GMT/BST)

10110111011012 Posts
Default

Quote:
Originally Posted by VBCurtis View Post
If you run linux, you can use CADO to factor numbers as large as you have patience for, and it's usually faster than yafu. We've developed paramaters hand-tuned to make cado faster, see the CADO subforum for details.
It's worth noting that if you are running windows 10 then it is possible to run CADO under WSL. Help would be available to set that up.
henryzz is offline   Reply With Quote
Old 2021-03-30, 18:57   #6
frmky
 
frmky's Avatar
 
Jul 2003
So Cal

1000001010002 Posts
Default

Speaking of participating casually, is there a way to flag in the reservations page that a number should be updated on the blue page? I don't want to reserve and unreserve it as I've only run it for a few hours typically. Such as 2644032 and 2861640.
frmky is offline   Reply With Quote
Old 2021-03-30, 19:24   #7
VBCurtis
 
VBCurtis's Avatar
 
"Curtis"
Feb 2005
Riverside, CA

13·367 Posts
Default

In the reservations thread, use "update" and then the sequence numbers on the same line.
VBCurtis is online now   Reply With Quote
Old 2021-03-30, 19:24   #8
RichD
 
RichD's Avatar
 
Sep 2008
Kansas

1100111111002 Posts
Default

Quote:
Originally Posted by frmky View Post
Speaking of participating casually, is there a way to flag in the reservations page that a number should be updated on the blue page? I don't want to reserve and unreserve it as I've only run it for a few hours typically. Such as 2644032 and 2861640.
Yes, I believe the keyword is update.

Update 2644032 2861640
RichD is offline   Reply With Quote
Old 2021-03-30, 19:25   #9
frmky
 
frmky's Avatar
 
Jul 2003
So Cal

1000001010002 Posts
Default

Ah. So simple. Thanks!
frmky is offline   Reply With Quote
Old 2021-04-02, 05:02   #10
bur
 
Aug 2020

163 Posts
Default

Thanks for the help, I didn't know that about CADO.


By chance I noticed 30081984 was stuck at n=903 with a C101 which turned out to be near brilliant with P49 and P52. So I'll continue that one from time to time.
bur is offline   Reply With Quote
Old 2021-04-30, 17:10   #11
bur
 
Aug 2020

163 Posts
Default

Small update, the A30081984 is now at 1971 with 156 digits and a c153 which cado is currently in the process of factoring.


The sequence took a long downdrive from approximately 120 digits to almost 60 but now is propelled by a 2^5*3*7 updriver.
bur is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Does this make sense? Chuck GPU to 72 2 2018-08-23 15:56
Favorite April Fools jokes and who online is expected to participate jasong Lounge 23 2015-04-07 08:43
What Makes Sense I and II Chuck GPU to 72 12 2013-02-25 01:52
Does trial factoring to 75+ make sense swl551 Software 10 2012-12-03 21:14
What is Randomness and does relative randomness make sense? sakreha Data 1 2005-02-04 23:29

All times are UTC. The time now is 23:07.

Thu May 6 23:07:16 UTC 2021 up 28 days, 17:48, 0 users, load averages: 2.57, 2.49, 2.36

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.