230 bits! M1237 (partially) factored

[petrw1]

George Woltman       Manual testing   1237      F-ECM    Nov  2 2010  3:07PM   0.0   0.0000  2538207129840687799335203259492870476186248896616401346500027311795983

Yeah George

I mean 230 bits

[Prime95]

Not me, I just record the result.

[Batalov]

That would be Lenstra et.al.

Yes, that's a 70-digit factor. The 3rd largest.

[bdodson]

Originally Posted by petrw1

George Woltman       Manual testing   1237      F-ECM    Nov  2 2010  3:07PM   0.0   0.0000  2538207129840687799335203259492870476186248896616401346500027311795983

Yeah George

I mean 230 bits

The title of this thread is distracting (from an excellent ECM factor),
even aside from the number of !!'s. Any chance of a moderator changing
digits to bits (or 230 to 70)? And, of course, M1237 is reduced to a
303-digit composite; rather than being factored. -bdodson

[petrw1]

Originally Posted by bdodson

The title of this thread is distracting (from an excellent ECM factor),
even aside from the number of !!'s. Any chance of a moderator changing
digits to bits (or 230 to 70)? And, of course, M1237 is reduced to a
303-digit composite; rather than being factored. -bdodson

[bdodson]

Originally Posted by petrw1

Sorry for grumbling; I had earlier read Bob's report of the p70 over on the
Cunningham Tables pages, objecting that M1237 is not in the Cunningham
range. The report from epfl in June describes the PS3 code as focussed
on 2^M -1 for M from 1100 to 1400, but this wasn't just any 2^M-1 ...
one of the few with no known factor. This is the first we've heard with
M > 1200, definitely a notable start, !!!! indeed.

-Bruce