[QUOTE=axn;427393]ECM work is not really duplicated or wasted.[/QUOTE]

True, but a record of who has done how much work where is never a bad thing.

What are the chances two people will run exactly the same curve? Extremely small?

I decided to take a punt on an exponent I had been assigned:

no factor for M77961971 from 2^75 to 2^76 [mfaktc 0.21 barrett76_mul32_gs]
no factor for M77961971 from 2^76 to 2^77 [mfaktc 0.21 barrett87_mul32_gs]
no factor for M77961971 from 2^77 to 2^78 [mfaktc 0.21 barrett87_mul32_gs]
M77961971 has a factor: 533579269373988895703777

took me over 1000GHz days of work :)

[url]http://www.mersenne.ca/exponent/77961971[/url]

I was thankful that that isn't easily found by P-1 though, didn't want to think I'd wasted my GPU cycles!

I know it's not the largest factor on here but it's probably the one I've spent the most time on and actually succeeded :)

Good find. I also take wave front first time exponents to 79 before assigning them to really old machines… For newer computers it makes sense to just run the LL test.

P-1 found a factor in stage #1, B1=615000.
UID: Jwb52z/Clay, M74683031 has a factor: 44664350248380904476819193 (P-1, B1=615000)

85.207 bits.

P-1 found a factor in stage #1, B1=630000.
UID: Jwb52z/Clay, M75909133 has a factor: 1460917115983359723544993 (P-1, B1=630000)

80.273 bits.

Another one bites the dust:

ECM found a factor in curve #216, stage #2
Sigma=6254442244963386, B1=11000000, B2=1100000000.
UID: lycorn/asteroid,[B] M15149 has a factor[/B]: 3519184049073327944797207886908866406374551 (ECM curve 216, B1=11000000, B2=1100000000),

141.336 bits, and prime.

It´s the lowest number I ever factored. Broke my previous record of M20011.

[QUOTE=lycorn;429221]Another one bites the dust:

ECM found a factor in curve #216, stage #2
Sigma=6254442244963386, B1=11000000, B2=1100000000.
UID: lycorn/asteroid,[B] M15149 has a factor[/B]: 3519184049073327944797207886908866406374551 (ECM curve 216, B1=11000000, B2=1100000000),

141.336 bits, and prime.

It´s the lowest number I ever factored. Broke my previous record of M20011.[/QUOTE]

Very nice :bow:

When I finish taking the 30k-31k range all up to a full T40 think I might head lower...

[QUOTE=lycorn;429221]It´s the lowest number I ever factored. Broke my previous record of M20011.[/QUOTE]
:tu: Congrats! This was a nice one!

P-1 found a factor in stage #1, B1=625000.
UID: Jwb52z/Clay, M75565537 has a factor: 148893459288809851942730148146257 (P-1, B1=625000),

106.876 bits.

[QUOTE=Jwb52z;430053]P-1 found a factor in stage #1, B1=625000.
UID: Jwb52z/Clay, M75565537 has a factor: 148893459288809851942730148146257 (P-1, B1=625000),

106.876 bits.[/QUOTE]

Any factor above 100 bits is a nice find :smile: