GNFS targets which need more ECM - Page 13

fivemack · 2016-09-05, 09:26

I will start polynomial selection on C183_127_118 tonight (expecting to run about a week on a GTX970); if someone finds an ECM factor while I'm doing that, so be it.

swellman · 2016-09-06, 12:45

Quote:

Originally Posted by fivemack

I will start polynomial selection on C183_127_118 tonight (expecting to run about a week on a GTX970); if someone finds an ECM factor while I'm doing that, so be it.

For what it's worth, I am currently running a few thousand curves @B1=3e8 on this number. At least that should minimize the chance of a p51 falling out of GNFS.

swellman · 2016-09-06, 12:47

Quote:

Originally Posted by swellman

I am going to ECM C197_141_86 to t55. Thanks.

Completed t55 with no factors found. Releasing number.

XYYXF · 2016-09-06, 15:25

C194_139_131 needs t55 :)

Code:

34455969275555543008894959549834908911628105576528370596905240101374255465270440968637373665134441021829321232908692364288101466106630998208891527349709493825004569737350006429544430702041657691

wombatman · 2016-09-06, 19:36

Quote:

Originally Posted by XYYXF

C194_139_131 needs t55 :)

Code:

34455969275555543008894959549834908911628105576528370596905240101374255465270440968637373665134441021829321232908692364288101466106630998208891527349709493825004569737350006429544430702041657691

I'll run Stage 1 (18k at B1=110e6), and Sean will handle Stage 2.

fivemack · 2016-09-06, 21:07

Trying 12800@3e8 on C187_142_59

This will have to have a pretty stellar polynomial to be a GNFS number - the obvious SNFS polynomial gets a yield of 1.6 or so and 0.30 seconds per relation, the first GNFS polynomial out of the box is 0.54 sec/rel.

14/9 am: 5120 curves done, no factor found. ETA about 23/9.

swellman · 2016-09-06, 23:30

Quote:

Originally Posted by fivemack

Trying 12800@3e8 on C187_142_59

This will have to have a pretty stellar polynomial to be a GNFS number - the obvious SNFS polynomial gets a yield of 1.6 or so and 0.30 seconds per relation, the first GNFS polynomial out of the box is 0.54 sec/rel.

Just be aware that VBCurtis ran 1600 curves @B1=3e8 (Stage 1) for this number and sent the residues to me for Stage 2. It will be done by tomorrow morning, but so far no factors found in ~1150 curves.

As to the issue of GNFS or SNFS, if a fast poly can't be found in short order I say go SNFS as soon as ECM is complete. My suggested list is based on estimated GNFS sieving times - it is only a guide. But I'm hoping ECM cracks this composite.

swellman · 2016-09-07, 08:13

Quote:

Originally Posted by fivemack

Trying 12800@3e8 on C187_142_59

Completed 1600 curves @B1=3e8 on C187_142_59 with no factors found. I do not plan on running any additional ECM on this number unless someone requests it.

swellman · 2016-09-09, 01:08

Quote:

Originally Posted by fivemack

I will start polynomial selection on C183_127_118 tonight (expecting to run about a week on a GTX970); if someone finds an ECM factor while I'm doing that, so be it.

I've run 1500 curves @B1=3e8 on this number. Aiming for another 1000 curves by next week, at which point I plan to stop ECM.

fivemack · 2016-09-11, 10:44

C200_139_113 was factored on 30 August at 14:30, but I didn't notice the entry in the log file until this morning. Factors posted on the ECM-results thread.

swellman · 2016-09-13, 20:36

Quote:

Originally Posted by fivemack

I will start polynomial selection on C183_127_118 tonight (expecting to run about a week on a GTX970); if someone finds an ECM factor while I'm doing that, so be it.

Completed 2500 curves @B1=3e8 with no factors found. I am stopping ECM efforts at this point.

2016-09-06, 15:25	#136
XYYXF Jan 2005 Minsk, Belarus 2⁴×5² Posts	C194_139_131 needs t55 :) Code: 34455969275555543008894959549834908911628105576528370596905240101374255465270440968637373665134441021829321232908692364288101466106630998208891527349709493825004569737350006429544430702041657691

2016-09-06, 21:07	#138
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 7²×131 Posts	Trying 12800@3e8 on C187_142_59 This will have to have a pretty stellar polynomial to be a GNFS number - the obvious SNFS polynomial gets a yield of 1.6 or so and 0.30 seconds per relation, the first GNFS polynomial out of the box is 0.54 sec/rel. 14/9 am: 5120 curves done, no factor found. ETA about 23/9. Last fiddled with by fivemack on 2016-09-14 at 07:25

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2016-09-05, 09:26	#133
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 7²×131 Posts	I will start polynomial selection on C183_127_118 tonight (expecting to run about a week on a GTX970); if someone finds an ECM factor while I'm doing that, so be it.

2016-09-11, 10:44	#142
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 1913₁₆ Posts	C200_139_113 was factored on 30 August at 14:30, but I didn't notice the entry in the log file until this morning. Factors posted on the ECM-results thread.