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 2012-06-30, 04:46 #34 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 5·1,997 Posts 6,447- (snfs difficulty 232) is waiting for a knight in shining armor and a reasonably modern home bread maker or a pressure cooker. I heard that those have ridiculously strong CPUs recently. Seriously, a good project for a home computer (a month on a quad-core, less on a hexa)! Write to Sam before too late.
 2012-06-30, 05:54 #35 debrouxl     Sep 2009 2·3·163 Posts SNFS 232 would be in the reach of RSALS, if the polynomial is quintic or sextic; but before I reserve this, I'd like to make some test sieving. What's the best SNFS polynomial for that number ?
 2012-06-30, 06:18 #36 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 5×1,997 Posts Like, Code: n: 616206951833849099509404360836151448327434546464783674219667801836184526666386100726932863976883607096993792653424911139417437242190871728765383549637572368393220053069548102628443735964624521073 type: snfs skew: 1.82 Y1: 1 Y0: -808281277464764060643139600456536293376 c6: 1 c3: 6 c0: 36 rlim: 55000000 alim: 55000000 lpbr: 30 lpba: 30 mfbr: 60 mfba: 60 rlambda: 2.6 alambda: 2.6 but try 3LP on both sides and see if it gets better? (For this size, maybe not.) Last fiddled with by Batalov on 2012-06-30 at 06:42
 2012-06-30, 08:21 #37 debrouxl     Sep 2009 2·3·163 Posts On one core of an otherwise idle i7-2670QM, at q=rlim/2, 2LP sieving and 3LP sieving produce the same yield at the same speed (only the fifth digit after the comma changes, which is way below noise). It doesn't hurt to make a 3LP sieving. I've sent an e-mail to Sam Wagstaff for reserving 6,447-.
 2012-06-30, 19:54 #38 debrouxl     Sep 2009 2×3×163 Posts BTW, before I queue it to the bread makers, pressure cookers and whatever else composes RSALS: how much ECM has 6,447- received ? I can't find the information (or at least, it's not obvious to me ^^) through http://homes.cerias.purdue.edu/~ssw/cun/ .
 2012-06-30, 20:02 #39 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 5·1,997 Posts Tons. Rest assured. S.S.W. himself found very large factors in this portion while it was still in the future extension stage. Also Bouvier recently added many more curves (supposedly with the GPU-GMP-ECM) and found some impressive factors. There's no direct evidence, though; but it has been observed that they ECMd even less snfs-difficult numbers very heavily in the past. I'd like to reserve the post-processing. Last fiddled with by Batalov on 2012-06-30 at 20:10
2012-06-30, 20:48   #40
jrk

May 2008

3×5×73 Posts

Quote:
 Originally Posted by debrouxl It doesn't hurt to make a 3LP sieving.
FYI, You might see an increase in the duplication rate, unless you also increase the large prime size.

 2013-09-12, 04:49 #41 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 5×1,997 Posts 6- tables were officially extended. (from 451 to 500) There may be some projects accessible to home-style enthusiasts, e.g. 6,471-.
 2016-08-04, 04:24 #42 frmky     Jul 2003 So Cal 52·101 Posts 6,383- is done.

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