20090718, 01:48  #12 
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
4279_{10} Posts 
I see no reason why it should. I never ran a test on F19/old_factors. The only time I'd expect to see that particular result again is if you stopped F19 and switched to F19/known_factors (including the new one) at the exact same iteration that I did. I don't know the iteration that I switched over, only that it was in the 330,000 range.
Last fiddled with by TimSorbet on 20090718 at 01:52 
20090718, 02:00  #13 
P90 years forever!
Aug 2002
Yeehaw, FL
2^{2}×13×157 Posts 

20090718, 02:15  #14 
Jul 2003
So Cal
5050_{8} Posts 
PFGW agrees with Alex and jrk's runs. Ignore the first digit of the residue as usual with PFGW.
Code:
PFGW Version 20090706.Win_Dev (Beta 'caveat utilitor') [GWNUM 25.11] PRP: Phi(2^20,2)/(705....524446080499713) 524097/524097 mro=0.03125 sum=1703.34/ Phi(2^20,2)/(70525124609*646730219521*37590055514133754286524446080499713) is composite: RES64: [061CCF4C8ABEF914] (1599.8707s+0.0889s) 
20090718, 05:38  #15 
Oct 2004
Austria
2482_{10} Posts 

20090718, 06:08  #16 
Jan 2005
Minsk, Belarus
2^{4}·5^{2} Posts 
A nice one :)
How about F14? It has no known factors still, but according to http://www.fermatsearch.org/stats/ecm_f.php some ECM curves with B1 = 43M or 110M may solve the problem :) 
20090718, 07:42  #17 
Nov 2008
2·3^{3}·43 Posts 
Can someone have a go with PFGW?

20090718, 08:15  #18 
Just call me Henry
"David"
Sep 2007
Liverpool (GMT/BST)
37×163 Posts 

20090718, 08:57  #19 
Nov 2008
100100010010_{2} Posts 

20090718, 10:54  #20 
Banned
"Luigi"
Aug 2002
Team Italia
3·1,619 Posts 
George, do you think possible to know the full name of the user Buckle, to update the list of Fermat factors discoverers?
Luigi 
20090718, 13:21  #21 
Apr 2007
Spessart/Germany
2·83 Posts 
Congratulations to Buckle and GIMPS.
One day we will have found more factors of Fermatnumbers than we found Mersenneprimes Matthias 
20090718, 13:42  #22  
Banned
"Luigi"
Aug 2002
Team Italia
12F9_{16} Posts 
Quote:
Apart from that, I guess that finding factors with ECM is a bit slowpacing, due to the big numbers involved and the popularity of the task. Sure enough, there will be a boost in ECMF after this discovery! Luigi 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
GIMPS' second Fermat factor!  rajula  Factoring  103  20190312 04:02 
New Fermat factor found!  ET_  Factoring  5  20110113 11:40 
New Fermat factor!  ET_  Factoring  21  20100315 21:02 
New Fermat factor!  ET_  Factoring  42  20081201 12:50 
New Fermat factor found!  ET_  Factoring  3  20041214 07:23 