Re: Mersenne: Fwd: Predicting Mersenne Primes
Hello Brian, In the statistical sense, yes, it is possible to predict. That is rather similar to the statistician's argument during the briefing for the first 1000 bomber raid over Cologne in May 1942 that predicted only two aircraft would collide, despite the incredible density of aircraft over the target, at any rate compared with modern air traffic control standards! The question asked by the crews was, of course, _Which_ two aircraft are going to collide? I'm convinced you are not aware that we remember the most terrible aircraft to aircraft collision ever; tomorrow 25 years ago. Tenerife, KLM 747 spinning up while a Pan Am Clipper was on the runway in dense fog. http://aviation-safety.net/database/1977/770327-1.htm Since then I've flown 622,253 km but that accident still gives me the shivers. cheers, teun _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne: Client configuration for a Duron?
Hi, What settings should I use in Prime95 on a 1 GHz Duron? Since there is no Duron in the options menu I tried Athlon, it seemed like the closest choice, but the performance I get is not quite as good as I expected compared to other people's benchmarks (about 25% slower). Should I switch to another CPU type in the options menu? Or should I use CpuSupportsPrefetch or something similar in local.ini? I have tried to find other explanations, but the machine runs no other CPU-hungry processes and has no built-in video on the motherboard. By the way, my other machine shows up as Unspecified type in my individual account report, even though it is correctly set as an Intel P4. Did I configure the client wrong in any way? Thanks in advance, Markus Landgren _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Client configuration for a Duron?
On Tuesday 26 March 2002 15:32, Markus Landgren [EMAIL PROTECTED] wrote: Hi, What settings should I use in Prime95 on a 1 GHz Duron? Since there is no Duron in the options menu I tried Athlon, it seemed like the closest choice, but the performance I get is not quite as good as I expected compared to other people's benchmarks (about 25% slower). Should I switch to another CPU type in the options menu? Or should I use CpuSupportsPrefetch or something similar in local.ini? Try CPUSupportsPrefetch=1 in local.ini Also try Prime95 v22 which has much better CPU detection code. By the way, my other machine shows up as Unspecified type in my individual account report, even though it is correctly set as an Intel P4. Did I configure the client wrong in any way? Probably not. My P4 system appears to be shown in my individual account report as an Athlon. I think there may be a problem with the server report code. Regards Brian Beesley _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
SV: Mersenne: Factors aren't just factors
reaction to another mail about this This happens all the time in different shapes so I would expect some happy day we found a crosslinked factor. we will never find a factor who is a factor of Mx and also of My simply because every factor give only one count with my algoritm and is factor of one or zero mersenne numbers for example the factor 7 is a factor of 2^3-1 and 2^6-1 and 2^9-1 and 2^12-1 etc.. but only 2^3-1 of a mersenne number so a factor can never be factor of Mx and My both Yep, you're so truly right. After I used the reverse factoring algorithm a bit harder it is not difficult to see that when you arrive at 1 (and started at 1) the same pattern will repeat (after all we are multiplying by 2 and mod'ing the same value repeatedly from 1). Some how it is no longer a mystery that 13421 is a factor of any 2k*61 (2684 in this case) as 61 is the highest prime in the factorized values of 13420 (factors: 2*2*5*11*61). Again: 2*5*11 is only the k. And also I have found reverse factoring will find it self as a value for Mprimes, 31 is a factor of M5 and so is 127 a factor of M7, and most often just it self -1 for very uinteresting values, like 107 divides M106. :-( On the other hand this insight could make me/us construct interesting and primetested values beyond the scope of Mprime (eg. max 66 bits for numbers below 21.600.000) but in the scope of GIMPS (any prime apx.72.300.000). At least I got one machine for which mprime has no relevance as some uncontrolled reboots happens and I would like a sleep to occur every 10 seconds. Then I can write my own reverse facoring for this machine - it is on anyway for other purposes. Happy hunting tsc _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne: duplicate messages
Hey everyone, sorry about taking so long to get around to tracking down why those duplicate messages are being sent to the list from our mail server. So far this is the only list that we are having this problem with, so I'm not sure what the cause is yet - I'm not sure if it is a problem with the list server or with our spam filter, but if I were to guess I'd say it's a little bit of both. ;) Wayne -- Wayne A. Tucker - [EMAIL PROTECTED] Network Engineer, Donobi Inc. _ Unsubscribe list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
