20071118, 01:09  #1 
"Mark"
Apr 2003
Between here and the
5×7×167 Posts 
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 ChezLeyland which includes links to:
Home Primes World Integer Factorization Center which includes links to:
Another factorials +/ 1 Primorials +/ 1 Fibonacci and Lucas Numbers Bernoulli and Euler Numbers EuclidMullin 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 base2 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 20141118 at 00:42 Reason: Updated NearRepdigit link 
20071119, 19:42  #2 
Just call me Henry
"David"
Sep 2007
Cambridge (GMT)
2^{2}×1,423 Posts 
it seems to me that the home primes project is inactive
is that so 
20071119, 20:00  #3  
Bamboozled!
May 2003
Down not across
2^{4}×5×127 Posts 
Quote:
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 exproject. Paul 

20071119, 20:27  #4 
Just call me Henry
"David"
Sep 2007
Cambridge (GMT)
2^{2}·1,423 Posts 
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 
20071119, 20:43  #5  
Jan 2007
Canada
2^{4} Posts 
Quote:
http://www.mersennewiki.org/index.ph..._Primes_Search 

20071119, 20:58  #6  
"Mark"
Apr 2003
Between here and the
5·7·167 Posts 
Quote:
Would HP49 make an interesting candidate for NFSNet or is NFSNet only focused on the Cunningham project? 

20071119, 22:20  #7 
Aug 2004
New Zealand
3×73 Posts 
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.

20080111, 04:51  #8  
Jun 2005
lehigh.edu
2^{10} Posts 
Quote:
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 offtopic (and I'm not suggesting this as a place for regularly posting factors), it might fit in the top10 thread over on gmpecm; the 2008 version is now up to nine entries, with p51 and p53 Cunninghams pending Paul's next update. Bruce 

20080111, 16:17  #9 
(loop (#_fork))
Feb 2006
Cambridge, England
6,353 Posts 
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.

20080111, 17:18  #10  
"Mark"
Apr 2003
Between here and the
1011011010101_{2} Posts 
Quote:
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 20080111 at 21:50 

20080215, 22:24  #11 
"Jason Goatcher"
Mar 2005
110110110001_{2} Posts 
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. 
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