Mersenne Digest Tuesday, June 13 2000 Volume 01 : Number 746 ---------------------------------------------------------------------- Date: Sun, 11 Jun 2000 11:21:48 EDT From: "Nathan Russell" <[EMAIL PROTECTED]> Subject: Re: Mersenne: Double Checking Stefan Struiker asked: >Is a single Double Check always enough to retire an exponent? > >Regards, >Stefanovic IIRC, George compares the residues once per week of all the double-checks compared that ween when he updates the database. If they don't match, then either one or both of the previous runs were in error; this happens about 1.5% of the time. That figure can be expected to increase as people continue double-checking longer runs. George reissues the mismatched exponents until two residues match. Nathan ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Mon, 12 Jun 2000 01:09:25 +0100 From: "Siegmar Szlavik" <[EMAIL PROTECTED]> Subject: Mersenne: Server busy - please try again in a few moments Hi all, I try to check in some results but I always get this error message... It says I should try it in a few moments, but I get this message now since 4-5 days :( Any idea, how I could check in the results? regards, Siegmar _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sun, 11 Jun 2000 17:18:34 -0700 From: Stefan Struiker <[EMAIL PROTECTED]> Subject: Re: Mersenne: Server busy - please try again in a few moments Same thing happens to me on "Release Exponents." Needs to be fixed. :-( Best Wishes, Stefanovic Siegmar Szlavik wrote: > Hi all, > > I try to check in some results but I always get this > error message... It says I should try it in a few moments, > but I get this message now since 4-5 days :( Any idea, > how I could check in the results? > > regards, > Siegmar > > _________________________________________________________________ > Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm > Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Tue, 13 Jun 2000 00:11:19 +0100 From: gordon spence <[EMAIL PROTECTED]> Subject: Mersenne: Factoring in the 60m range This is a call to those people that I was mailing the results of trial factoring to, for numbers in the 60-69m range. To cut a long story short I have 'lost' your email addresses. If anyone else still wants this data, then please mail me off the list and I'll add you to the distribution list. 60-62m are all factored to 54 bits now, all the rest are at least 51 bits.... regards G _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Mon, 12 Jun 2000 22:00:57 -0600 From: "Matt Goodrich" <[EMAIL PROTECTED]> Subject: Mersenne: Slowdown in iteration speed I just finished a Lucas Lehmer test on exponent 9822067. My PII 350 was doing a iteration every .320 seconds. The next exponent it started was 103500203. It is now taking .421 seconds per iteration. I have a feeling this is due to the fact it is using a different FFT. Is my assumption correct or do I have a problem here. Would appreciate any information on this. As you can tell I know nothing about the math involved here. I got started on this because I downloaded prime 95 on the recommendation of a friend. He said it was a good way to stress test hardware. He was right about that! After seeing the web site and what George was trying to accomplish I decided to let my computers run it 24/7. They were on all the time anyways. I figured they might as well be doing something productive. Matt _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Mon, 12 Jun 2000 23:20:29 -0700 From: Eric Hahn <[EMAIL PROTECTED]> Subject: Mersenne: Common practice for P-1 math? Greetings all, I was wondering if it was common practice (ie: the norm) for P-1 to take the product of two or more factors when giving out a found factor, if two of more factors are found? To clarify, I was curious about how P-1 would indicate more than one factor being found. So, I took M113 and fed it into Prime95 with the bounds of B1=200, B2=20000. Prime95 notified me that P-1 had found a factor in Stage #1, and that the factor was 9734174361238150513. This factors out to 3391 * 23279 * 65993 * 1868569, all of which are known factors of M113. Again, is this the norm for P-1? Eric _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Tue, 13 Jun 2000 08:55:31 +0000 From: Alexander Kruppa <[EMAIL PROTECTED]> Subject: Re: Mersenne: Common practice for P-1 math? Eric Hahn wrote: > Greetings all, > > I was wondering if it was common practice (ie: the norm) for > P-1 to take the product of two or more factors when giving out > a found factor, if two of more factors are found? > Yup, each factor f, for which b^E == 1 (mod f) (b is the base, usually 3, E is the product of primes and prime powers below the bound), is found in the GCD. They are reported as one composite factor, but it is easy to take that one apart with a general (i.e. not only working mod Mp) P-1 factorer. Ciao, Alex. _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Tue, 13 Jun 2000 11:13:40 +0200 (MET DST) From: "Benny.VanHoudt" <[EMAIL PROTECTED]> Subject: Mersenne: Primenet server Hi, In the last three weeks prime95 hasn't succeeded in contacting the Primenet server. I have changed the UseHTTP=0 line in the prime.ini to UseHTTP=1 and restarted the program but it doesn't seem to make any difference. Any suggestions ? Thanks, Benny - ------------------------------------------------------------------- Benny Van Houdt, University of Antwerp Dept. Math. and Computer Science PATS - Performance Analysis of Telecommunication Systems Research Group Universiteitsplein, 1 B-2610 Antwerp Belgium email: [EMAIL PROTECTED] - -------------------------------------------------------------------- _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Tue, 13 Jun 2000 03:52:02 -0700 From: Stefan Struiker <[EMAIL PROTECTED]> Subject: Mersenne: What Happens Once A Factor Has Been Reported? To All: Once a factor has been logged for an M-candidate, either by P-1 or by "the other" method, what M-happens? Is a different sort of double-checking automatically done? Best Wishes, Stefanovic _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Tue, 13 Jun 2000 09:29:21 -0400 From: Jeff Woods <[EMAIL PROTECTED]> Subject: Re: Mersenne: Slowdown in iteration speed At 10:00 PM 6/12/00 -0600, you wrote: >I just finished a Lucas Lehmer test on exponent 9822067. My PII 350 was >doing a iteration every .320 seconds. The next exponent it started was >103500203. It is now taking .421 seconds per iteration. I have a feeling >this is due to the fact it is using a different FFT. Is my assumption >correct or do I have a problem here. Would appreciate any information on >this. Yes, you've jumped up in FFT size, and that slows the iteration down. You can see a rough breakdown of the FFT size barriers at: http://www.mersenne.org/status.htm The break you passed over was at about 10,320,000. _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Tue, 13 Jun 2000 17:16:29 -0000 From: "Brian J. Beesley" <[EMAIL PROTECTED]> Subject: Re: Mersenne: Primenet server On 13 Jun 00, at 11:13, Benny.VanHoudt wrote: > In the last three weeks prime95 hasn't succeeded in contacting the > Primenet server. I have changed the UseHTTP=0 line in the prime.ini > to UseHTTP=1 and restarted the program but it doesn't seem to > make any difference. Any suggestions ? Do you have a DNS server, or do you have entropia.com hardcoded into the "hosts" file? If the latter, try changing the address to 216.120.55.141 which is the new address for www.mersenne.org - equate this to entropia.com as well. Regards Brian Beesley _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ End of Mersenne Digest V1 #746 ******************************
