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 2013-07-14, 16:34 #34 chris2be8     Sep 2009 22×3×167 Posts To clarify my last post, I'm now sieving 84^131-1 (the last of the 3 I listed). I meant I'll queue the first of the two firejuggler found for processing. Sorry for the confusion. Chris PS. Has anyone worked on 39^158+1 (the middle one of the 3 I listed)? wombatman found a poly for 37+148+1 (the first one I listed). PPS. And many thanks again.
 2013-07-14, 16:46 #35 firejuggler     Apr 2010 Over the rainbow 32×281 Posts Will work on the fourth number of post 85 once i'm done proccessing the hits on the C176 Last fiddled with by firejuggler on 2013-07-14 at 17:03
 2013-07-14, 16:55 #36 VBCurtis     "Curtis" Feb 2005 Riverside, CA 52×11×17 Posts Chris- See post #123 for the poly for the middle number. -Curtis
 2013-07-14, 21:39 #37 VBCurtis     "Curtis" Feb 2005 Riverside, CA 124316 Posts I am doing poly search for the C152 from Aliquot sequence 3408:1287. I'm using my usual settings from this thread: Default stage1 norm, -nps stage 2 norm roughly default/18 (1.5e20 in this case). I get my usual 100kb of -nps output in 12 hrs, but -npr produces ZERO polys, even when I loosen the min e value lower than default (3.5e-12 instead of default 3.63e-12). Are there numbers where the polys found are just terrible compared to expectations? I just loosened the min value to 3.0e-12, and I get plenty of poly output- so it's not a software error, far as I can tell. Coeffs for these tests are in the 3-6M range, which seems pretty standard for a C152. Edit: Should I experiment with stage-2 norm for the npr step? Last fiddled with by VBCurtis on 2013-07-14 at 21:52
 2013-07-14, 23:09 #38 fivemack (loop (#_fork))     Feb 2006 Cambridge, England 2×3,191 Posts I think there are still some infelicities in the table of norms and min-E; I'm getting ludicrously high yield around 160 digits and, as you mention, very low yields at C152. For 9096168730717325471174345357545088389800010197483699618393510880224063584308788722339816387794620862849936796290458644418085736533343831602295288484811 (151 digits) I ended up with (at least in October 2011, parameters may be changed now) with 20k polynomials in msieve.dat.p for each 1000-A5 range. But running 3936090042216234613709067994268312375269653484027874112960552153626006376667321970650341587753839767751476856325227586616119340003347991887464416435517 (151 digits) last week I got no more than ten polynomials in some such ranges. For 4202701474560599145864668379214403877602720577806362075074321031589277391358279336093140444841799054199486202393045071085680275027063857193327313335405064090859 I got 3-5k polynomials for each 1000-A5 range
 2013-07-14, 23:09 #39 jasonp Tribal Bullet     Oct 2004 67168 Posts We've sometimes seen input sizes where the chosen bounds are too conservative, in that too many hits get found, but almost never the opposite. Also, the numerical value of the skew that you find doesn't have very much to do with sieving quality, so it isn't a big deal if you find a poly with large skew. It usually is just an indication that your search is in an early phase, where you get a polynomial with a very good root score that requires really stretching the skew to achieve.
 2013-07-15, 00:22 #40 firejuggler     Apr 2010 Over the rainbow 32×281 Posts nothing better in the 400-420M range than what I already posted for the C176
 2013-07-15, 02:21 #41 firejuggler     Apr 2010 Over the rainbow 9E116 Posts for (421^101-1)/((421-1)*3637*52859291287277*15527015834461272375419*384360771211140230121323*3103491858106402597710257788494888754189303) I have a flare Code: R0: -3827996057819835127917748724463 R1: 131539370518073 A0: -602715843958817538679066753523087553532960 A1: 45781605633077304430392767759952648 A2: 1068428398276002038958183140 A3: -48864994613567679099 A4: -571757632456 A5: 9180 Mon Jul 15 02:40:31 2013 skew 46132459.25, size 3.041e-015, alpha -8.806, combined = 2.126e-012 rroots = 5 skew is horrible; found a second hit @ Code: R0: -1766358190766735704168317054222 R1: 112645411133573 A0: 493231366602757377598300196387454965 A1: 2761322107950780473345799391567 A2: -16280562559665314935321596 A3: -18743805941490767137 A4: 7812064738909 A5: 438840 skew 1418693.51, size 2.267e-015, alpha -5.886, combined = 1.806e-012 rroots = 5 Skew is better but score, not so much I will extend search upto a leading coef of 3M
 2013-07-15, 03:05 #42 wombatman I moo ablest echo power!     May 2013 1,741 Posts It's not better than what Curtis got, but I'll include my best so far for posterity and comparison of skews and whatnot: Code: R0: -2985364064788479756004867693430704 R1: 338252966469030421 A0: -850411162568663002775199166333595393602815 A1: 912278472619088502716551535935935096 A2: 30604247888096781733208334160 A3: -36949595121636590255444 A4: -2832475140989925 A5: 100568520 skew 8586463.91, size 2.728e-017, alpha -8.174, combined = 1.281e-013 rroots = 3
 2013-07-15, 04:26 #43 VBCurtis     "Curtis" Feb 2005 Riverside, CA 111038 Posts Each 5-digit increase in size takes roughly double the effort to sieve- and should have a corresponding increase in poly-select time. This C176, at roughly 20 digits larger than our other searches, deserves ~15x more effort than we have given the other numbers. I've been putting ~3 days into the 155-157s in this thread, which may be why I'm often getting better polys. I will be putting at least a week into my part of the C176 search, more if I/we don't find a "lucky" poly. If the three of us put a week each into it, we have a good chance to find a poly worth sieving with. For this search, I think that's 1.45e-13 at minimum.
 2013-07-15, 09:45 #44 firejuggler     Apr 2010 Over the rainbow 47418 Posts (421^101-1)/((421-1)*3637*52859291287277*15527015834461272375419*384360771211140230121323*3103491858106402597710257788494888754189303) again, Code: R0: -1379023836637462618160987168271 R1: 117578686639117 A0: -36460967635057249759007362058565617216 A1: 82932889219472424950843244760688 A2: 66710061781474557308819682 A3: -21316592155418774201 A4: -9644497418536 A5: 1513008 skew 2662773.43, size 2.688e-015, alpha -7.134, combined = 2.021e-012 rroots = 5 I will resume my search on the C176

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