mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > PrimeNet > GPU to 72

Reply
 
Thread Tools
Old 2020-11-17, 05:40   #1
LOBES
 
Mar 2019
USA

1011102 Posts
Default GPU72 Largest 100 Factors Found

I was clicking around the site and found the "Largest 100 Factors Found" page interesting:


https://www.gpu72.com/reports/largest_factors/


Is that up-to-date? If so, does it update automatically or is it something Chris updates manually?


I only ask because the largest as of this writing is:


734277451864747167510502805298930545450478445879


I found a factor today of exponent 105032111:



499400852887245323683941126088449355702834653807158087



Unless of course, I am completely reading that wrong, which is entirely possible. It is all just so fascinating, and I have such a small grasp of it.
LOBES is offline   Reply With Quote
Old 2020-11-17, 05:49   #2
chalsall
If I May
 
chalsall's Avatar
 
"Chris Halsall"
Sep 2002
Barbados

2·3·1,567 Posts
Default

Quote:
Originally Posted by LOBES View Post
I was clicking around the site and found the "Largest 100 Factors Found" page interesting:

Unless of course, I am completely reading that wrong, which is entirely possible. It is all just so fascinating, and I have such a small grasp of it.
That list is automatically updated. And while your find is impressive, it is, unfortunately, a "composite factor".

BTW, it's a complete fluke that I'm at the top of the list. There are many others putting in far more P-1 efforts than myself; I just got lucky there.
chalsall is online now   Reply With Quote
Old 2020-11-17, 05:50   #3
paulunderwood
 
paulunderwood's Avatar
 
Sep 2002
Database er0rr

DCD16 Posts
Default

Quote:
Originally Posted by LOBES View Post
I was clicking around the site and found the "Largest 100 Factors Found" page interesting:


https://www.gpu72.com/reports/largest_factors/


Is that up-to-date? If so, does it update automatically or is it something Chris updates manually?


I only ask because the largest as of this writing is:


734277451864747167510502805298930545450478445879


I found a factor today of exponent 105032111:



499400852887245323683941126088449355702834653807158087



Unless of course, I am completely reading that wrong, which is entirely possible. It is all just so fascinating, and I have such a small grasp of it.
Congrats! However:

Code:
? factor(499400852887245323683941126088449355702834653807158087 )

[       290582744822559701357207 1]

[1718618403140893608084889221841 1]

Last fiddled with by paulunderwood on 2020-11-17 at 05:50
paulunderwood is offline   Reply With Quote
Old 2020-11-17, 09:44   #4
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

34·113 Posts
Default

Adding to it, that list only contains factors which are prime and were discovered for assignments taken with GPU-72 (if that's not understood).

To see a list with ever largest factors found, with the method used to find them, see mersenne.ca list.

Last fiddled with by LaurV on 2020-11-17 at 09:45 Reason: s/lost/list/ geez man, fatty fingers!
LaurV is offline   Reply With Quote
Old 2020-11-17, 14:35   #5
LOBES
 
Mar 2019
USA

2×23 Posts
Default

Thanks so much for the responses. That is what I was expecting.


Me: See really long number, longer than the other numbers, think I'm onto something...


Reality: Nah. Not really.
LOBES is offline   Reply With Quote
Old 2020-11-24, 15:28   #6
ZFR
 
ZFR's Avatar
 
Feb 2008
Bray, Ireland

2·3·19 Posts
Default

Wow, those bit levels are way higher than anything that can be (reasonably) done on TF. Those top factors are all from P-1?

Last fiddled with by ZFR on 2020-11-24 at 15:28
ZFR is offline   Reply With Quote
Old 2020-11-24, 19:18   #7
chalsall
If I May
 
chalsall's Avatar
 
"Chris Halsall"
Sep 2002
Barbados

100100101110102 Posts
Default

Quote:
Originally Posted by ZFR View Post
Those top factors are all from P-1?
Yes.
chalsall is online now   Reply With Quote
Old 2020-11-24, 20:21   #8
ZFR
 
ZFR's Avatar
 
Feb 2008
Bray, Ireland

2·3·19 Posts
Default

Quote:
Originally Posted by chalsall View Post
Yes.
And unlike TF, P-1 is better done on CPU than GPU, right?

So if I want to devote one of my CPU workers to P-1 instead of PRPs, I can just get a list from GPU72, copy it under that worker in mprime's worktodo, and that's it? B1 and B2 will be chosen automatically by mprime?
ZFR is offline   Reply With Quote
Old 2020-11-24, 20:29   #9
chalsall
If I May
 
chalsall's Avatar
 
"Chris Halsall"
Sep 2002
Barbados

2×3×1,567 Posts
Default

Quote:
Originally Posted by ZFR View Post
And unlike TF, P-1 is better done on CPU than GPU, right?
There's some excellent GPU P-1 software available now. But Prime95/mprime (CPU) is by far the easiest to work with.

Quote:
Originally Posted by ZFR View Post
So if I want to devote one of my CPU workers to P-1 instead of PRPs, I can just get a list from GPU72, copy it under that worker in mprime's worktodo, and that's it? B1 and B2 will be chosen automatically by mprime?
Contemporaneous P-1 work is available from both Primenet and GPU72. Know that GPU72 is currently working at higher ranges (105M) than Primenet (101M) for P-1 assignments. And so the work takes slightly more compute (and, thus, time).

Last fiddled with by chalsall on 2020-11-24 at 20:30 Reason: s/Contemerious/Contemporaneous/; # Smelling mistake.
chalsall is online now   Reply With Quote
Old 2020-11-24, 21:07   #10
ZFR
 
ZFR's Avatar
 
Feb 2008
Bray, Ireland

7216 Posts
Default

Thanks. Going to grab some from GPU72 when the next PRP finishes next week. Let's see if I can get my name on that top 100 page.
ZFR is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Largest k*2^n-1 Primes Found In 2019 Thomas11 Riesel Prime Search 2 2020-01-01 05:32
Largest k*2^n-1 Primes Found In 2015 Kosmaj Riesel Prime Search 0 2016-01-01 13:45
Largest k*2^n-1 Primes Found in 2013 Kosmaj Riesel Prime Search 3 2014-12-12 07:14
formula for largest prime found debasish Miscellaneous Math 20 2007-09-28 03:48
Largest prime found yet by 15k search TTn 15k Search 1 2004-05-11 03:04

All times are UTC. The time now is 16:47.

Fri Jan 22 16:47:08 UTC 2021 up 50 days, 12:58, 0 users, load averages: 1.82, 1.76, 1.84

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.