On 7 Sep 00, at 9:27, Steve wrote:
> I've found 2 factors so far during P-1 testing and received 0.001 years
> (about 8 or 9 hours) credit for each. Not much consolation as it 'cost'
> upwards of 100 P90 hours each to find them, but it beats getting no credit
> for spending the same amount of time not finding any.
You always did get a small amount of credit for finding a factor
(using trial factoring) compared with the effort that went in i.e.
you got about 10x as much credit for running trial factoring
unsuccessfully than for finding the "largest possible" factor in the
range you were searching.
I think PrimeNet credits factors found using P-1 as though they were
found using trial factoring.
However there is, as yet, no credit given for unsuccessful P-1
factoring effort.
Don't lose sight of the fact that the purpose of running P-1 is to
save time overall by avoiding running LL tests on those exponents
which happen to be susceptible to P-1 factoring effort.
Also, if you're running LL tests, you're certainly spending not more
than 5% of your total effort running P-1 (significantly less than
that if you're running double-checks), which is more than offset by
the efficiency improvement between v18 and v19.
Regards
Brian Beesley
_________________________________________________________________________
Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm
Mersenne Prime FAQ -- http://www.exu.ilstu.edu/mersenne/faq-mers.txt
