[URL="http://www.mersenne.org/report_exponent/?exp_lo=9578651&full=1"]Yaaarrrrr[/URL]! :chappy:
After months of dry ECM spell...

[edit: actually, I would be better with some TF here, hehe, the factor is only 66 bits!]

[QUOTE=PageFault;387950]Those are very smooth, nice finds. I assume they are P-1, Stage 1 factors? I have one from a few years back, somewhere in a backup.

I'm seeing my ECM finds to be all rough, although my data is lacking.

Crunch on, happy hunting![/QUOTE]
The smooth ones have already been found with P-1.

yep, they are found with P-1.

[QUOTE=LaurV;387954][URL="http://www.mersenne.org/report_exponent/?exp_lo=9578651&full=1"]Yaaarrrrr[/URL]! :chappy:
After months of dry ECM spell...

[edit: actually, I would be better with some TF here, hehe, the factor is only 66 bits!][/QUOTE]

You´d probably be better off running ECM on exponents much lower than 9M, as they are much more suitable for ECM (and much harder to TF).

I digested what the server gave me.
I have stopped anyhow, after I found that factor, and concentrate now on DCTF, after the last arguments in the GPU72 thread.

That´s right, exponents handed by the server for ECM are in the 9M range. I wonder why so high. That´s why I get them manually.
Just out of curiosity, when you say you gave up ECM to concentrate on DCTF does that mean you are moving CPU(s) to DCTF, or you were using some program that would allow running ECM on a GPU? Or...?

IIRC 2^1018-1 is still the maximum GPU-ECM can handle.

The difficulty with determining the desired TF level before running ECM lies with the differences in CPU and GPU capabilities and available resources. On ECM candidates with no (or very few) curves you MIGHT be better off running TF a bit deeper IF you have the GPU resources available (which should really be doing DCTF and LLTF). I personally wouldn't recommend running TF on anything <10M, since most of those have had a fair share of P-1 and ECM.

Look at this one:

[I]ECM found a factor in curve #181, stage #2
Sigma=3947118002300977, B1=250000, B2=25000000.
UID: lycorn/asteroid, M507149 has a factor: 1834049842474634749280697499913 (ECM curve 181, B1=250000, B2=25000000)
[/I]
Factor is prime, and its k=2[SUP]2[/SUP] × 452049063114251124738661

Only ECM could have found it...

M70637093 has a factor: 27886899376721683540674433 (84.5 bits)
k=2[SUP]6[/SUP] × 3[SUP]3[/SUP] × 7 × 11 × 13 × 23 × 7877 × 629899
k is pretty smooth and has a lot of very small factors.

P-1 stage 1 factor
 

A nice P-1 stage 1 factor popped up yesterday 91.5 bits (28 digits):

P-1 found a factor in stage #1, B1=1500000.
UID: VictordeHollander/PCVICTOR, M68842181 has a factor: 3483933495938630920516781759 (P-1, B1=1500000)

k = 25303770488754786259 = 7 × 11 × 977 × 12641 × 26777 × 993703

First a 2^2 * prime k, then an odd k...