GPU attack on double Mersennes?

[TheMawn]

What we could do is to search for it, no matter how high it is.

As opposed to what?

[Prime95]

Originally Posted by lbh134679

The best way to prove MM127 is composite is to find a factor. What we could do is to search for it, no matter how high it is.

The chance of success is exceedingly low -- roughly about 1%. If that does not deter you, join the group running the mmff program. Your help will be appreciated.

[Mini-Geek]

Originally Posted by Prime95

The chance of success is exceedingly low -- roughly about 1%. If that does not deter you, join the group running the mmff program. Your help will be appreciated.

How do you figure that? It seems to me that we can keep on searching until we either find a factor or decide that an LL is feasible. Granted, we may never have a computer that succeeds in either of those tasks, but I don't see why there's a limit to how far we can push the bounds, and thus, the probability of a factor (converging to 1, when we must find a factor because we've tried all possibilities).

(the current bit level is ~184, so for every extra bit, which is double the effort of the last, a ~1/184 chance of a factor should be expected)

[Prime95]

Originally Posted by Mini-Geek

How do you figure that?

We've TFed to 2^184 and the going is getting slow (took about a year to get the last bit level done). In the near term, we can do 2 maybe 3 more bit levels for about a 1% chance.

[ewmayer]

Originally Posted by Batalov

There's a very likable Coursera class on right now, so I guess some of the terminology simply rubs in. You see, the professor makes a clear distinction there - between utterances, linguistic acts, speech acts, and finally arguments. (and that's is even before the discussion of strength and validity an arguments. That is some utterances are not linguistic acts, not all linguistic acts are speech acts, and not all of those are even entering arguments. It's loads of fun! I recommend joining if it is still open.)

Being a libertarian, I believe any utterances, (non)linguistic acts, (non)speech acts and entering (or not) arguments between consenting adults are no one else's business.

[Robish]

Originally Posted by Prime95

The chance of success is exceedingly low -- roughly about 1%. If that does not deter you, join the group running the mmff program. Your help will be appreciated.

I would like to have a go, can you give me a link to the group pls?

Cheers

Rob.

[Batalov]

http://mersenneforum.org/forumdisplay.php?f=99
for all sorts of information, and
http://www.doublemersennes.org/

[Mini-Geek]

Originally Posted by Prime95

We've TFed to 2^184 and the going is getting slow (took about a year to get the last bit level done). In the near term, we can do 2 maybe 3 more bit levels for about a 1% chance.

Ok, gotcha.