C172_122_101 Factored
 

While running some ECM to t55 on C172_122_101 before NFS@Home took it over, we got a very lucky hit:

[code]
prp58 = 1650430517128404490777037764740117883381822227909709574311 (curve 426 stg2 B1=110000000 sigma=2120187100 thread=0)
[/code]

Results posted at fdb.

Reserving the following for ECM to the t50 level:

C193_143_93
C198_144_122
C199_148_84

Thanks.

From extra ECM work at B1=43e6 before sieving on NFS@Home's 14e, because the number was sieving rather slowly:
C186_148_33 = 719726763463002887376866660892645155066748304865851 (p51) * p135.

Posted on FactorDB with sigma value.

C199_148_84 Factored (ECM)
 

prp50 = 25907554367228195065530436290852247123243711496329

stg2 B1=43000000

sigma=995636360

[QUOTE=swellman;410612]Reserving the following for ECM to the t50 level:

C193_143_93
C198_144_122
...

Thanks.[/QUOTE]

Both numbers survived 7600 curves @B1=43M with no factors found. Releasing.

Reserving C193_146_35 for ECM to the t50+ level. Thanks.

[QUOTE=swellman;409227]Reserving C188_149_78 for ECM to t50, and if necessary t55.

Test sieving suggests this may be a GNFS candidate, but I'm hoping it falls to ECM.[/QUOTE]

Ran 7600 curves @B1=43M, and then 18000+ curves @B1=110M. No factors found. Releasing number.

I'm fairly certain this is best factored with GNFS, but that's a discussion for another day.

Please check the updated pages: [url]http://www.primefan.ru/xyyxf/status.html#0[/url]

[QUOTE=swellman;413233]Reserving C193_146_35 for ECM to the t50+ level. Thanks.[/QUOTE]

Ran 7600 @B1=43M with no factors found. Releasing number.

Reserving C199_146_61 for ECM to t50, t55 level.

Reserving C191_146_46 for ECM to the t50 level.