GNFS targets which need more ECM

[swellman]

Originally Posted by swellman

C187_142_59 is still under ECM towards t55. Estimate ~2 weeks to finish it.

Completed 18000+ curves @B1=11e7 on ver 6 of GMP-ECM with no factors found. I guess it's ready for yoyo etc.

[fivemack]

I have a shiny new GTX1080 on the table downstairs, which ought to be quite good at GPU-ECM. May I reserve C200_139_113 ?

My ecm-toy tool suggests (on the assumption that it's already had 7610@43e6) a recipe of 5700@43e6 then 1400@110e6 then 34200@260e6 then 2500@850e6 - though my tool does not know about GPUs so may have a different recipe once I've done some timings on the GTX1080.

[swellman]

Originally Posted by wombatman

I've started working on C174_136_75 at B1=110e6. The Stage 1 curves from C174_136_69 have been sent to Sean to carry out Stage 2.

C174_136_75 has been fully factored in Stage 2 using Ben's Stage 1 results..

Using B1=110000000-110000000, B2=776278396540, polynomial Dickson(30), sigma=3:2930077740
Step 1 took 0ms
Step 2 took 189135ms
********** Factor found in step 2: 49944378186590670787707675987630380113819949603
Found probable prime factor of 47 digits: 49944378186590670787707675987630380113819949603
Probable prime cofactor ((75^136+136^75)/7367054022024847648487749442785036214607516444205627891167308884527791057041545443)/49944378186590670787707675987630380113819949603 has 127 digits

Found this factor in less than a day, thanks to Ben's heavy lifting, All credit goes to him!

I am still working Stage 2 of C174_136_69.

[swellman]

I am going to ECM C197_141_86 to t55. Thanks.

[wombatman]

I'll get started on the 18k curves needed at B1=110e6.

[wombatman]

Originally Posted by swellman

C174_136_75 has been fully factored in Stage 2 using Ben's Stage 1 results..

Using B1=110000000-110000000, B2=776278396540, polynomial Dickson(30), sigma=3:2930077740
Step 1 took 0ms
Step 2 took 189135ms
********** Factor found in step 2: 49944378186590670787707675987630380113819949603
Found probable prime factor of 47 digits: 49944378186590670787707675987630380113819949603
Probable prime cofactor ((75^136+136^75)/7367054022024847648487749442785036214607516444205627891167308884527791057041545443)/49944378186590670787707675987630380113819949603 has 127 digits

Found this factor in less than a day, thanks to Ben's heavy lifting, All credit goes to him!

I am still working Stage 2 of C174_136_69.

Sweet! Always good to get confirmation that my GPU curves are coming out properly.

[fivemack]

4992 curves completed at B1=3e8 B2=3178599824416 on 136_109, no factor.

Will do polynomial selection once C254_125_111 has had 4992 curves at 3e8

[swellman]

Ryan is running GNFS on C185_134_99.

[swellman]

Originally Posted by swellman

Ryan is running GNFS on C185_134_99.

Ryan solved this in 3 days using GNFS. p70*p115

[swellman]

Originally Posted by wombatman

Sweet! Always good to get confirmation that my GPU curves are coming out properly.

Yes it was sweet. And WraithX's Python driver for GMP-ECM made it easy to run.

Just email me the next file whenever Stage 1 is done. I may lag you a bit but I'll (eventually) run Stage 2 on anything you send me. This includes any unreserved GNFS and even the SNFS numbers needing more ECM thread, if that interests you. Thanks.

[wombatman]

Preparing Stage 1 curves on C179_136_87 at B1=110e6.