mersenneforum.org  

Go Back   mersenneforum.org > Factoring Projects > Factoring

Reply
 
Thread Tools
Old 2007-11-18, 01:09   #1
rogue
 
rogue's Avatar
 
"Mark"
Apr 2003
Between here and the

5×7×167 Posts
Exclamation Links to Factoring Projects

Since we have a "Links to Factoring Programs" thread, I thought that it would be nice to have a list of factoring projects and their links. Here are a bunch; Paul Zimmerman has collected another bunch

Cunningham Project
NFSNet
Chez-Leyland which includes links to:Eleven Smooth
Home Primes
World Integer Factorization Center which includes links to:
Another factorials +/- 1
Primorials +/- 1
Fibonacci and Lucas Numbers
Bernoulli and Euler Numbers

Euclid-Mullin Sequence

Maximal and minimal brilliant numbers

Smarandache numbers (eg 12345)
Reverse Smarandache numbers (eg 54321)

Sylvester's Sequence (explanation at wikipedia; this is a slightly impractical project since these are not SNFS numbers and no cofactor is less than 400 digits)

There is a result about base-2 pseudoprimes which would be assisted by factorisations of two annoying large numbers (a C183 and a C209, of impractical SNFS difficulty, so ECM's really all that will help, and they've been ECMed to at least t40), available here.

Last fiddled with by Batalov on 2014-11-18 at 00:42 Reason: Updated Near-Repdigit link
rogue is offline   Reply With Quote
Old 2007-11-19, 19:42   #2
henryzz
Just call me Henry
 
henryzz's Avatar
 
"David"
Sep 2007
Cambridge (GMT)

22×1,423 Posts
Default

it seems to me that the home primes project is inactive
is that so
henryzz is offline   Reply With Quote
Old 2007-11-19, 20:00   #3
xilman
Bamboozled!
 
xilman's Avatar
 
May 2003
Down not across

24×5×127 Posts
Default

Quote:
Originally Posted by henryzz View Post
it seems to me that the home primes project is inactive
is that so
I don't know. It may not be dead, it may only be sleeping.

There were times when Alex and I were the only people contributing and, because it could easily take us a month or more to complete a single factorization, it could easily appear to an onlooker that it was an ex-project.

Paul
xilman is offline   Reply With Quote
Old 2007-11-19, 20:27   #4
henryzz
Just call me Henry
 
henryzz's Avatar
 
"David"
Sep 2007
Cambridge (GMT)

22·1,423 Posts
Default

i havent looked that long but what evidence is there on the site that it hasnt been inactive since 2005
it says last updated then
henryzz is offline   Reply With Quote
Old 2007-11-19, 20:43   #5
Shiva
 
Shiva's Avatar
 
Jan 2007
Canada

24 Posts
Default

Quote:
Originally Posted by henryzz View Post
it seems to me that the home primes project is inactive
is that so
There seems to be more recent activity at:
http://www.mersennewiki.org/index.ph..._Primes_Search
Shiva is offline   Reply With Quote
Old 2007-11-19, 20:58   #6
rogue
 
rogue's Avatar
 
"Mark"
Apr 2003
Between here and the

5·7·167 Posts
Default

Quote:
Originally Posted by xilman View Post
I don't know. It may not be dead, it may only be sleeping.

There were times when Alex and I were the only people contributing and, because it could easily take us a month or more to complete a single factorization, it could easily appear to an onlooker that it was an ex-project.

Paul
I've spent time on it, but not recently and not on HP49. It is a decent project for those who want to learn GNFS without taking on time consuming factorizations.

Would HP49 make an interesting candidate for NFSNet or is NFSNet only focused on the Cunningham project?
rogue is offline   Reply With Quote
Old 2007-11-19, 22:20   #7
sean
 
sean's Avatar
 
Aug 2004
New Zealand

3×73 Posts
Default

Quote:
Originally Posted by rogue View Post
Would HP49 make an interesting candidate for NFSNet or is NFSNet only focused on the Cunningham project?
HP49 is currently 204 digits and thus exceeds the largest number ever factored with GNFS (at 200 digits). Also, the ECM effort is still only at the 110e6 level and thus may well still have factors below 60 digits. Before this number could be considered much more ECM would be needed, and even then I suspect there would be any number of better candidates near this size.
sean is offline   Reply With Quote
Old 2008-01-11, 04:51   #8
bdodson
 
bdodson's Avatar
 
Jun 2005
lehigh.edu

210 Posts
Default

Quote:
Originally Posted by rogue View Post
Since we have a "Links to Factoring Programs" thread,
...[*]Bernoulli and Euler Numbers
...
The above list of open numbers from Bernoulli, Euler and Bell is now
somwhat dated, as Sam has been using Purdue's condor grid, and also
asked me to have a look. Anyone considering a pass through these numbers
should check with Sam for a current list. As a particular instance, the
Euler number E196 = C328 = 5.29.197.C323 has a recent factor

p50 = 26034939865747697437451558982836040663625026070193

leaving a C274. If our local Gerbal regards this as too far off-topic
(and I'm not suggesting this as a place for regularly posting factors),
it might fit in the top10 thread over on gmp-ecm; the 2008 version
is now up to nine entries, with p51 and p53 Cunninghams pending
Paul's next update. -Bruce
bdodson is offline   Reply With Quote
Old 2008-01-11, 16:17   #9
fivemack
(loop (#_fork))
 
fivemack's Avatar
 
Feb 2006
Cambridge, England

6,353 Posts
Default

I have (ab?)used my Moderate Powers and created a thread for the Euler and Bernoulli numbers. If anyone wants to write and run the trivial perl script to parse out all the composite numbers into a text file suitable for ecmnet, I'll attach that file to the thread.
fivemack is offline   Reply With Quote
Old 2008-01-11, 17:18   #10
rogue
 
rogue's Avatar
 
"Mark"
Apr 2003
Between here and the

10110110101012 Posts
Default

Quote:
Originally Posted by fivemack View Post
I have (ab?)used my Moderate Powers and created a thread for the Euler and Bernoulli numbers. If anyone wants to write and run the trivial perl script to parse out all the composite numbers into a text file suitable for ecmnet, I'll attach that file to the thread.
As long as you are at it, could you create a sticky for this thread, combine the links into the first post and delete any redundant/unneccessary posts?

Done evening of 11/1; the gerbil wishes to check that he has gnawed away all and only what should have been gnawed.

Last fiddled with by fivemack on 2008-01-11 at 21:50
rogue is offline   Reply With Quote
Old 2008-02-15, 22:24   #11
jasong
 
jasong's Avatar
 
"Jason Goatcher"
Mar 2005

1101101100012 Posts
Default

Could you add the Odd Perfect Number Search to the list?

I know it isn't an official project yet, but I'm sure if anybody wanted to throw a couple GHz weeks of power at it, wblipp would be happy to oblige them.

His ecm server isn't a dedicated server, so if the person is addicted to 100% cpu at all times, they'll want a backup ecm project in addition to attaching to his server.
jasong is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Links to factoring programs smh Factoring 71 2019-02-21 22:33
Factoring projects algorithms - What is Aliqueit ? Romuald Factoring 75 2016-08-27 09:46
Links to Factoring Programs rogue Factoring 32 2009-09-17 11:40
Links. Xyzzy Forum Feedback 2 2007-03-18 02:17
Memory usage of various factoring projects... Xyzzy Factoring 3 2003-08-23 21:10

All times are UTC. The time now is 19:24.

Wed Aug 5 19:24:05 UTC 2020 up 19 days, 15:10, 2 users, load averages: 1.59, 1.76, 1.74

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.