nt: Tuesday, October 12, 1999 8:33 PM
Subject: Re: probability of primeness (was: Re: Mersenne: splitting up 10m
digit primes)
On Tue, Oct 12, 1999 at 10:53:18PM -0400, Darxus wrote:
I'm hoping what I have to say in this email might be important.
On Tue, 12 Oct 1999, George Woltman wrote:
At 11:00 AM 10/12/99 -0400, you wrote:
I'm okay with that. But I think, if possible, it'd be good to break up
primes into like, 1 month chunks, distribute them. I'm sure it'd be
possible, I just don't know if/how much it'd impact speed.
Not possible. Well, POSSIBLE, but it would actually
On Tue, 12 Oct 1999, George Woltman wrote:
I admire your patience!
Thank you :)
I think it said 1 in 250,000 chance if finding
a prime. So.. on average, it would probably take that one computer, by
itself, 241,250 years to find a 10m digit prime. Right ?
Define "probably". 241,250
From: [EMAIL PROTECTED]
How about an option when you hit "QUIT GIMPS" to
upload your P and Q files to Primenet, so someone
can at least finish the job?
I'm running an exponent in the 33 million area and the save-files are over
seven megabytes in size! That would require no small amount of
There is now a prize for factoring Fermat numbers too.
Neat. Where's the info ?
I think Richard Crandall is offering a prize for Fermat factors
(http://www.perfsci.com). John Selfridge is also anouncing a prize
for factors of various numbers which "ought to be prime". I don't
think that
On Tue, 12 Oct 1999, Rick Pali wrote:
From: [EMAIL PROTECTED]
How about an option when you hit "QUIT GIMPS" to
upload your P and Q files to Primenet, so someone
can at least finish the job?
I'm running an exponent in the 33 million area and the save-files are over
seven megabytes in
As I posted some days back;
Anyone who wants to quit an exponent after investing a PII-400-month or
more, please contact me, and we'll try to carry it on, using it for the
QA effort.
It could take some major bandwidth-minutes if more than a few exponents
are quit, however.
Ken
At 04:15 PM
On Tue, Oct 12, 1999 at 10:53:18PM -0400, Darxus wrote:
I'm hoping what I have to say in this email might be important.
On Tue, 12 Oct 1999, George Woltman wrote:
At 04:12 PM 10/12/99 -0400, you wrote:
And how is the probability of finding a prime calculated ?
It is roughly
I think trial factoring is done to 2^68 for an exponent around 33 million.
Thus your chance is 2 * 68 / 3300.
Okay, so as far as we know, each number is equally likely to be prime, and
this probability is just based on how much has already been tested ?
Umm, no. The probability that
