C197_141_86
 

I'm starting ECM on C197_141_86 @B1=3e8. Any assistance appreciated as it will take me months to run a total of 35k curves! Thanks.

C183_127_118 polynomial selection complete (6.16e-14) after about ten days GTX970, queued for NFS@home 15e

[code]
n: 557843211495743177683592548259152103019157806320222492777417238153330163884210450572089643842473332359131869814432694008591563920406374135588669620668818032145113057151165365662598677
# norm 9.321950e-18 alpha -6.754461 e 6.160e-14 rroots 3
skew: 25725965.71
c0: 8629604503440443574427099566307468860305449
c1: 702517846744246553843996419145999432
c2: -391074549026567389341288496
c3: -3492903354361574634524
c4: -131416864044177
c5: 2972268
Y0: -179756596806464926135694274035958414
Y1: 70563574863702077
lpbr: 32
lpba: 32
mfbr: 64
mfba: 64
alambda: 2.6
rlambda: 2.6
alim: 267000000
rlim: 267000000
[/code]

Starting 15360@3e8 on C190_147_80. ETA October 12th or so. This one is a definite GNFS number so I'll go to polynomial select if I don't find a factor.

12800@3e8 completed on C187_142_59, queued to NFS@home as an SNFS number.

First 2560@3e8 done on C190_147_80 with no factor; two weeks left to go

A baseline for C190_147_80
 

@fivemack
[code]Msieve v. 1.52 (SVN 958)
R0: -5905042549723500009001055332802622058
R1: 37485600041549830328201
A0: -68961321751470581862288083179970209204753602690
A1: -1291430739837431006503844192625839243409
A2: 54425961346881195166555059961698
A3: -84024929178638834288563
A4: 558879297811780
A5: 744000
skew 241500348.84, size 1.098e-018, alpha -8.275, combined = 1.798e-014[/code]

Would you like to carry on with polynomial selection while I do the rest of the ECM? If I find a factor you've wasted a bit of time but if I don't we can start GNFS immediately.

[QUOTE=fivemack;443529]Would you like to carry on with polynomial selection while I do the rest of the ECM? If I find a factor you've wasted a bit of time but if I don't we can start GNFS immediately.[/QUOTE]
That's exactly what I am doing now. Any better polynomials will be posted here.

[QUOTE=XYYXF;441736]C194_139_131 needs t55 :)[code]34455969275555543008894959549834908911628105576528370596905240101374255465270440968637373665134441021829321232908692364288101466106630998208891527349709493825004569737350006429544430702041657691[/code][/QUOTE]

Ran the Stage 1 results from wombatman through Stage 2 for a full t55 with no factor appearing. Releasing number.

A baseline for C194_139_131
 

[QUOTE=swellman;443646]Ran the Stage 1 results from wombatman through Stage 2 for a full t55 with no factor appearing. Releasing number.[/QUOTE]

[code]Msieve v. 1.52 (SVN 958)
R0: -55986401424611946428056603049588543554
R1: 3838676364672103848179
A0: -811576234887306226475236058590016018814968306520
A1: -14318458177354805714674072090827924673421
A2: -224193805473537249267111962773262
A3: -276022812088009232574617
A4: -972086447094240
A5: 626400
skew 504961862.13, size 4.398e-019, alpha -8.988, combined = 1.038e-014[/code]

C190_147_80 done
 

Half way through post-processing block 6 (so after between 6400 and 7680 curves), what do I see but

[code]
Resuming ECM residue saved by pumpkin@pumpkin with GMP-ECM 7.0.4-dev on Mon Oct 3 15:36:57 2016
Input number is 1335457808734464343314854537246304689234708722979175902020924285497855864380980679645344591471787934157384494320774809209960811864149959545943467611311344272153721303401442519421526786111421 (190 digits)
Using B1=300000000-300000000, B2=3178599824416, polynomial Dickson(30), sigma=3:1335943107
Step 1 took 0ms
Step 2 took 342452ms
********** Factor found in step 2: 529263930485556913427765081020479918618459164558826119381243107
Found prime factor of 63 digits: 529263930485556913427765081020479918618459164558826119381243107
Prime cofactor 2523236011018717360835112820955862254490101773156841320218758903889678535000458347077778089885172212240699622535778411226350303 has 127 digits
[/code]

Sorry to make Max's polynomial search redundant; I make that the second-largest ECM factor from the project to date, and the first I've found to make the top twenty.

I will now join swellman with an initial 12800 curves at 3e8 on C197_141_86.