I hit it with some ECM and it's now in GNFS (sieving). Should finish factoring Saturday night.

Now it's moved to a C132. Ran 900 curves at B1=1M with no factors found. Somebody take it.

[QUOTE=swellman;371010]Now it's moved to a C132. Ran 900 curves at B1=1M with no factors found. Somebody take it.[/QUOTE]

[CODE]
Using B1=4528314, B2=4528314-8562077170, polynomial Dickson(6), sigma=1:1590548922
Step 1 took 15496ms
Step 2 took 5996ms
********** Factor found in step 2: 20563314438829833994736809392823600171
Found probable prime factor of 38 digits: 20563314438829833994736809392823600171
Probable prime cofactor 5822471939999663653675700987632417753596924497311978679187997966823194528620642268179424639277 has 94 digits[/CODE]

C137 @ i2123
 

2^3 * 3^2 * ... * C137

~400 @ 11e6 found the p42.

[QUOTE=RichD;371069]2^3 * 3^2 * ... * C137

~400 @ 11e6 found the p42.[/QUOTE]
I would take this C137.

C181 @ i2124
 

2^3 * 3^3 * ... * C181

2t40 done, no factor.

Nice work all, with this sequence. Maybe it would be the time to abandon it, if ECM turns out fruitless? I mean, I was the guy who propose it and prop it in the beginning, but now I may be the guy to kill it :redface:
I mean, over C180, GNFS is not something easy anymore, and we can concentrate the efforts on pushing other sequences higher. Let this sleep for a while, and in few years we will have better tools (i.e. accessible to "normal" guys like me) to attack it at a cheaper cost (time and electricity). Not that it wouldn't be enough sequences under 120 digits to pick up from...

[QUOTE=LaurV;371629]Nice work all, with this sequence. Maybe it would be the time to abandon it, if ECM turns out fruitless? I mean, I was the guy who propose it and prop it in the beginning, but now I may be the guy to kill it :redface:
I mean, over C180, GNFS is not something easy anymore, and we can concentrate the efforts on pushing other sequences higher. Let this sleep for a while, and in few years we will have better tools (i.e. accessible to "normal" guys like me) to attack it at a cheaper cost (time and electricity). Not that it wouldn't be enough sequences under 120 digits to pick up from...[/QUOTE]
[B]+1.
[/B]
Sound reasonable to me.

[QUOTE=prgamma10;371628]2^3 * 3^3 * ... * C181

2t40 done, no factor.[/QUOTE]
t45 done, no factor.

[QUOTE=prgamma10;371768]t45 done, no factor.[/QUOTE]
t50 done, no factor.

Everyone finished with this one? If so I will unsticky it.