Using B1=3000000, B2=5706890290, polynomial Dickson(6), sigma=1530872857
Step 1 took 39279ms
Step 2 took 15158ms
********** Factor found in step 2: 91954313213315372804640364402916669
Found probable prime factor of 35 digits: 91954313213315372804640364402916669
Probable prime cofactor 225653454632250912355819749800394215303262812368642804348375684664354501593585125058011274595549690867289505339828574041099734323 has 129 digits


Next: c143 = 24974657531872376085838030641699839995405167943859266286028403658435682652095566362402178295861538671288908969271773700577295839144850244114869

[quote=dekcarki;200335]
. . .
********** Factor found in step 2: 91954313213315372804640364402916669
Found probable prime factor of 35 digits: 91954313213315372804640364402916669
Probable prime cofactor 225653454632250912355819749800394215303262812368642804348375684664354501593585125058011274595549690867289505339828574041099734323 has 129 digits
. . .
[/quote]

Pardon my ignorance (I'm trying to work on that)...

If a "probable" prime is found, how do we decide it is indeed prime? Do we submit it to the db and it verifies for us?

[quote=EdH;200340]Pardon my ignorance (I'm trying to work on that)...

If a "probable" prime is found, how do we decide it is indeed prime? Do we submit it to the db and it verifies for us?[/quote]
Yep, that's a good way to do it. If you want to verify it locally, the easiest way is to use PARI/gp's isprime function.
[url]http://pari.math.u-bordeaux.fr/[/url]

[QUOTE=EdH;200340]Pardon my ignorance (I'm trying to work on that)...

If a "probable" prime is found, how do we decide it is indeed prime? Do we submit it to the db and it verifies for us?[/QUOTE]

Don't shoot the messenger but ....

Factoris says

Verification of primality
Yes, 91954313213315372804640364402916669 passes the rigorous primality test, therefore is really a prime.

And Dario Alpern's site says.

225 653454 632250 912355 819749 800394 215303 262812 368642 804348 375684
664354 501593 585125 058011 274595 549690 867289 505339 828574 041099 734323
is prime

170@1e6 on the c143, no factor.

1400 done @ 3e6, no factor

1000 more in queue

I've done 650 curves at B1=1e6 (on two cores).

249@3e6, no factor. Switching to 11e6.

[quote=petrw1;200349]Don't shoot the messenger but ....[/quote]

Why would I assault someone bearing good news?:smile:

Thank you for the replies.

If the db testing is sufficient I would prefer that method to extra work here.

If I can get ggnfs fully functioning on my linux machines, I might like to try helping out with this particular sub-project. I can use gmp-ecm on my linux machines. Maybe I should familiarize myself better with that program first...

BTW i have switched my p-1 efforts to the c143
B1 of 1e10 is already done

ecm@3e6: 1880 + 249 (Andi47) = 2129 curves

will switch to 43e6