[QUOTE=LaurV;469754]OK, that's one... It didn't save GIMPS any time, however, because the 6M DC were long passed when the factor was found, but that is a clear GIMPS miss which they (TJAOI) found, and it is ok with us, based on the rule that "is nicer to expose a factor, than to expose a verified LL residue". :razz:[/QUOTE]
And what can you say about [URL="https://www.mersenne.org/report_exponent/?exp_lo=998961239&exp_hi=&full=1"]M998961239[/URL]?

That is one of those 612 exponents I mentioned in post #427.

Why was the 64-65 bit factor not found back in 2010?

[QUOTE=ATH;470000]Why was the 64-65 bit factor not found back in 2010?[/QUOTE]

Computers aren't perfect.

[QUOTE=alpertron;469998]And what can you say about [URL="https://www.mersenne.org/report_exponent/?exp_lo=998961239&exp_hi=&full=1"]M998961239[/URL]?[/QUOTE]
That is a good one. Hat off! :bow:
It saved some poor guy 57 years from now one or two weeks of doing LL and DC :razz:
Just kidding.
But it is a good find.

[QUOTE=ATH;470000]
Why was the 64-65 bit factor not found back in 2010?[/QUOTE]

To me it looks like there was no factorization attempt below 2^66 before.

[QUOTE=heliosh;470009]To me it looks like there was no factorization attempt below 2^66 before.[/QUOTE]

A lot of the "trivial" factoring had already been done beforehand, long long time ago so the historical results weren't available. I think we talked about this recently, but anyway, there's an assumption it was done even if not specifically recorded as such. As George mentioned, computers aren't perfect and this wouldn't be the first time factors were missed by some early pioneer of TF.

[QUOTE=alpertron;469998]And what can you say about [URL="https://www.mersenne.org/report_exponent/?exp_lo=998961239&exp_hi=&full=1"]M998961239[/URL]?[/QUOTE]

P-1 would have found this factor.

[QUOTE=masser;470036]P-1 would have found this factor.[/QUOTE]

Even so, it's a datapoint about where previous TF has failed, and TJAOI has located this datapoint years before said hypothetical P-1 would be run.

Today TJAOI has just finished finding 65-bit prime factors.

The latest prime factor found was 36893479659369377441 from [URL="https://www.mersenne.org/report_exponent/?exp_lo=67215557&full=1"]M67215557[/URL] which has 64,999999668 bits.

Closing in on 6,000,000 TF factors
And over 18,000 more ECM

He also recently found a 66-bit factor that was missed by previous trial factoring. I don't remember the exponent, but it was about 60 million and that KYOJI_KAMEI should have found the factor.

Also, anyone know TJAOI's forum username?