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 2009-09-05, 09:57 #78 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT/BST) 3·1,979 Posts sounds like a nice speedup
 2009-10-02, 13:31 #79 bsquared     "Ben" Feb 2007 357910 Posts The C149 cofactor of 2,1103+ factors as Code: prp71 factor: 27431741084859107578898898421551267742974922940343893878046067425448793 prp79 factor: 1556091952348959582001775235021990804021486863097137505396479684826710491931017 Sieving took about 10 Msec, mostly on k8/2000 CPU's, over a period of about 3 days. Matrix was: Code: matrix is 2629565 x 2629791 (763.9 MB) with weight 197532831 (75.11/col) sparse part has weight 173945286 (66.14/col) And took about 8 hours to solve using 4 threads and msieve 1.42. Factors on the 3rd dependency.
2009-10-02, 15:00   #80
bdodson

Jun 2005
lehigh.edu

40016 Posts

Quote:
 Originally Posted by bsquared The C149 cofactor of 2,1103+ factors as Code: prp71 factor: 27431741084859107578898898421551267742974922940343893878046067425448793 prp79 factor: 1556091952348959582001775235021990804021486863097137505396479684826710491931017 ...
Nice split, thanks. Page 112 is filling quickly, now that NFS@home
is rolling. -Bruce

 2009-10-27, 11:09 #81 R.D. Silverman     Nov 2003 22×5×373 Posts Result Here is 2,1119+ c200 = p98.p102 p98 = 20040124693285584251275658639027356795005997983166503259002925748843101252000415087461577089005691 p102 = 625882785605273947776074968547215676534733253779816321285269078611530402049151514362433726695828370139 2,1128+ is about 75% sieved. I will do 2,1149- next. Please reserve it for me.
2009-10-31, 09:02   #82
frmky

Jul 2003
So Cal

32·13·19 Posts

NFS@Home has finished 2,851+:

93-digit prime factor:
604367679922143570622653720534643264325088703722918681771377012408526538323960466739317375681

121-digit prime factor:
9169466285112385145786919034786866010313540919125471575107378058834025916913248388550311330518963212204000020093390193123
Attached Files
 2p851.zip (5.0 KB, 167 views)

 2009-11-01, 06:10 #83 Raman Noodles     "Mr. Tuch" Dec 2007 Chennai, India 4E916 Posts 2,851+ already seems to be completely factorized. Prof. Brent's page lists 2,856+ as the first hole as early as 17 January 2009 http://wwwmaths.anu.edu.au/~brent/ftp/factors/holes.txt 6,335+ is 98.5% sieved. 6,340+ is running on 16 machines this weekend, each machine running two instances of the sieve program. By using nohup, it is a very useful facility, running even after logging off, without disturbing others, the switch user facility being already there so. 2 more machines are running the last part of 6,335+ right now. Each machine that I use so is a Core 2 Duo system only, not the Pentium 4 or the other old systems at all. I thought that I would keep up this matter secret and then tell up after I have completed up the numbers, thus, so far. Are any of these numbers already being completely factored up? Last fiddled with by Raman on 2009-11-01 at 06:34
2009-11-01, 06:48   #84
frmky

Jul 2003
So Cal

32·13·19 Posts

Quote:
 Originally Posted by Raman 2,851+ already seems to be completely factorized. Prof. Brent's page lists 2,856+ as the first hole as early as 17 January 2009 http://wwwmaths.anu.edu.au/~brent/ftp/factors/holes.txt
It is now. 2,851+ and 2,853+ were on the most wanted list posted with page 111. And you may wish to check out screen. It allows you to swap consoles that persist even after you log out.

 2009-11-02, 17:55 #85 10metreh     Nov 2008 2×33×43 Posts As RDS mentioned in the 11- thread, Paul Zimmermann has found p56 = 23105068079006744574164595960708060074392947703954994281 from 2,889+. Cofactor was a p139. Not quite big enough for top 10 ECM for 2009, but it's quite good. Anyone have details of B1 and sigma?
 2009-11-02, 17:57 #86 frmky     Jul 2003 So Cal 32×13×19 Posts From Paul Z.'s original report: number is 2^889+1 B1: 11e7 sigma: 3628226645
2009-11-08, 00:20   #87
frmky

Jul 2003
So Cal

42578 Posts

NFS@Home has completed 2,853+.

101-digit prime factor:
35382013370709363956405022720063581613953920882540914664616009343887731347839468592930021200199529033

121-digit prime factor:
2236316864019158840735959359498635477634259430025869474767592038357190540362426624729661441180602192404592046105651917609
Attached Files
 2p853.zip (9.7 KB, 163 views)

2009-11-15, 08:22   #88
frmky

Jul 2003
So Cal

32×13×19 Posts

Quote:
 Originally Posted by frmky NFS@Home has completed 2,853+.
And 2,856+.

69-digit prime factor:
371738331695243321977108382044919572516026026284025337809051528873569

155-digit prime factor:
1470431097748887434191347619709790426741577494661631392301635111934205526218983658\
3327383143164509904769943490657458018679109514305697811863653995781888513
Attached Files
 2p856.zip (9.2 KB, 161 views)

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