Indeed.
That one was a real teaser...
I've been squeezing M5879 hard, but to no avail. In a week or so B1=44000000 will be fully tried.

P-1 found a factor in stage #1, B1=660000.
UID: Jwb52z/Clay, M78647759 has a factor: 479779549412952847946157679 (P-1, B1=660000)

88.633 bits.

[QUOTE=Jwb52z;436491]P-1 found a factor in stage #1, B1=660000.
UID: Jwb52z/Clay, M78647759 has a factor: 479779549412952847946157679 (P-1, B1=660000)

88.633 bits.[/QUOTE]

Nice find, a lot of time saved for the project :smile:

two sub-40K down
 

[Fri Jun 24 20:28:53 2016]
ECM found a factor in curve #203, stage #1
Sigma=61541048953985, B1=3000000, B2=300000000.
UID: BloodIce/Mjolnir4, M35591 has a factor: 137728575725419534448289970535976313 (ECM curve 203, B1=3000000, B2=300000000) ~117 bits

[Sat Jun 25 05:40:14 2016]
ECM found a factor in curve #576, stage #2
Sigma=7459404930796059, B1=3000000, B2=300000000.
UID: BloodIce/Mjolnir4, M35537 has a factor: 1532578067845635137525157423375548167 (ECM curve 576, B1=3000000, B2=300000000) ~120 bits

It seems to be very hard to find factors on sub-20K exponents, but in 30K range they are plenty of exponents which could be factored.

whoaa! nice! congrats!
Anyone does PRP tests for the two?

I have checked the remaining cofactors of course (among the first thing I do after a factor in the lower range). Or do you mean PRP of the factors? I hope mersenne.org has a code to deal with the factors once they arrive.

34537 is down
 

[Sat Jul 2 02:44:21 2016]
ECM found a factor in curve #1191, stage #2
Sigma=8753620462425117, B1=3000000, B2=300000000.
UID: BloodIce/Mjolnir4, M34537 has a factor: 442299498283919300728290218941317553933121 (ECM curve 1191, B1=3000000, B2=300000000) ~138 bits, the cofactor is not prime.

[QUOTE=bloodIce;437015]I have checked the remaining cofactors of course (among the first thing I do after a factor in the lower range). Or do you mean PRP of the factors? I hope mersenne.org has a code to deal with the factors once they arrive.[/QUOTE]
PRP of the remaining cofactor. Mersenne.org verifies reported factors for primality (amoungst other things).
I believe James site also does PRP test on sub 1M exponents after new factors have been reported.

[QUOTE=bloodIce;437400][Sat Jul 2 02:44:21 2016]
ECM found a factor in curve #1191, stage #2
Sigma=8753620462425117, B1=3000000, B2=300000000.
UID: BloodIce/Mjolnir4, M34537 has a factor: 442299498283919300728290218941317553933121 (ECM curve 1191, B1=3000000, B2=300000000) ~138 bits, the cofactor is not prime.[/QUOTE]

I did 400 curves on this just before Xmas, shame they were the wrong 400 :smile:

[QUOTE=Gordon;437495]I did 400 curves on this just before Xmas, shame they were the wrong 400 :smile:[/QUOTE]
Remember M90679, we are even :smile:. But, if you wish take any of "mine exponents" and find a factor, I will only be happy. Cheers and keep the factors coming.

[QUOTE=Gordon;436501]Nice find, a lot of time saved for the project :smile:[/QUOTE]

Thank you, and here's another I just found on my screen:

P-1 found a factor in stage #1, B1=660000.
UID: Jwb52z/Clay, M78866311 has a factor: 122507948640290214554639 (P-1, B1=660000)

76.697 bits.