mersenneforum.org ECM work on 4788:i2617 c172
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 2011-01-07, 10:39 #1 schickel     "Frank <^>" Dec 2004 CDP Janesville 2×1,049 Posts ECM work on 4788:i2617 c172 After a lot of heavy lifting from bchaffin and Batalov, we have now come to a c172 on line 2617: Code: 2229348552361822129355877431354933637944777944345113399577912185681707793442268713514615675586421258420770429669349552195250785917635169750211125857968489791489287723679679 Batalov finished "all" curves at 11M. Members of the Forum have been running curves at 43M and 110M. Here's the current count: Code:  Level Count Who 11,000,000 5500 Batalov 43,000,000 205 Andi_HB 43,000,000 547 schickel 110,000,000 59 schickel 110,000,000 324 em99010pepe 110,000,000 50 debrouxl 110,000,000 10400 bsquared 110,000,000 5010 Yoyo@home 260,000,000 50 debrouxl 260,000,000 2600 bsquared 260,000,000 116 em9901pepe 260,000,000 4770 Yoyo@home 260,000,000 10 Joshua2 850,000,000 10 Joshua2 850,000,000 5000 Yoyo@home Here are the current P-1/P+1 levels: Code: Type B1 B2 Who P-1 1e11 1e17 Andi47 P+1x3 1e9 def. Joshua2 Anyone care to run more P+/-1? Are we going to be able to tackle this as a GNFS job? jrk has found a decent enough polynomial. Last fiddled with by Mini-Geek on 2011-01-22 at 15:01 Reason: Still boggling over 850M(!)
 2011-01-07, 13:49 #2 Mini-Geek Account Deleted     "Tim Sorbera" Aug 2006 San Antonio, TX USA 17·251 Posts I've done P-1 with B1=1e8, doing P-1 with B1=1e9, B2=205702371522480 (GMP-ECM default), will follow that with P+1 with B1=1e8. I'll just edit the first post with P-1/P+1 statuses, and we can update that if/when someone ups the bounds.
2011-01-07, 20:11   #3
Batalov

"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

22×3×7×109 Posts

Quote:
 Originally Posted by schickel ...Are we going to be willing/able to tackle this as a GNFS job?
It is surely doable - if RSALS (or NFS@Home) would be willing to help as they have in the past.
But a lot of ECM - first. Ask yoyo@home, too?

 2011-01-07, 21:04 #4 debrouxl     Sep 2009 977 Posts 50 curves at B1=26e7, no factor. A C172 would certainly be over-demanding for the poor little 14e siever, so no dice for RSALS. IMO, 15e in NFS@Home would be a better bet...
2011-01-08, 08:00   #5
Andi47

Oct 2004
Austria

7×353 Posts

Quote:
 Originally Posted by schickel a c172 What should be our [ECM] target on this?
Hmmm... My guess is for t55 (or maybe a bit more?). Can any experienced ECMer confirm or correct this?

 2011-01-08, 16:36 #6 Andi_HB     Mar 2007 Germany 23·3·11 Posts 113 curves more at B1=43e6, no factor.
 2011-01-08, 17:49 #7 bsquared     "Ben" Feb 2007 13·257 Posts 3200 curves at 110M done.
 2011-01-09, 10:53 #8 yoyo     Oct 2006 Berlin, Germany 3×197 Posts How many ecm curves are still needed at the different B1 levels: 3M: 11M: 43M: 110M: 260M: 850M: I would start with the lowest on in yoyo@home and complete them. yoyo
 2011-01-09, 11:16 #9 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 22×3×7×109 Posts bsquared's 3200 curves at 110e6 make 43e6 curves unnecessary. Now, 11M: 4480 43M: 7553 110M: 17770-3200 And this will be a ~32% level (I'd say enough, but opinions differ) Last fiddled with by Batalov on 2011-01-09 at 11:17
 2011-01-09, 12:27 #10 yoyo     Oct 2006 Berlin, Germany 24F16 Posts I started to run 5000 curves on B1=110M. yoyo
 2011-01-09, 14:28 #11 bsquared     "Ben" Feb 2007 1101000011012 Posts 3200 more at 110M done.

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