I came across 2 problematic numbers. All below runs are on Core 2 Duo E6600 with Windows Vista Home Premium and PFGW Version 1.2.0 for Windows [FFT v23.8] I...
Hello, The last version I'v found of PFGW for Linux is v1.2 , dated January 2005. The executable seems to work well, though I have some cores. About the source...
Gang, I've been very quiet for a long time, but given I have some idle time, I have a FC6 machine (dual core) running in 64 bit mode. I keep it well updated...
This is a fairly lengthy reply to the postings of Jens and Paul from last April. Because of the length of the documentation, I will start with a summary of my...
I ran into something that seems rather odd and most likely erroneous. As you can see from the command line, I was testing for GF and xGF cases on a rather...
No retest is needed. The numbers were found quickly due to not having to "backtrack". The code computes 2^(2^1832495), 3^(2^1832496), 5^n 7^n, 11^n. It then...
What caused me the most concern was the 1232842.226000 time shown. Note that the wall clock time for the GF(11) case was on the order of 1-2 seconds, yet it...
... The gwnum library is indeed too aggressive in choosing FFT sizes. I'm working on isolating the problem. Unfortunately, any fix will appear in the 25.6...
... Background: FFT sizes have been set by trial and error using lots of Mersenne-only data over many years. When upgrading the FFTs to handle a wider...
Is it possible to build and run pfgw on SunOS 5.10 ? I tried to build it on SunOS 5.10 Generic_118844-26 i86pc i386 i86pc but I got the following error: ...
The strange behaviour is that on a Linux machine the build works fine but , on the SAME SOURCE CODE LINES OF THE SUN OS ERROR, gives the following warnings: ...
Hello group, Do you have any idea why openpfgw systematically crashes on systems with xeon processors ? I have 2 servers, one linux box and one windows box...
Not sure on Windows, but on Linux, it's failing because NX (no execute) or XD (execute disable) is set in your BIOS. This is designed to prevent some trojans...
Hi Greg, ... executed. ... another ... You're perfectly right! I've check my W2003SP2 server and my Linux server and both have NX activated. Thanks a lot for...
... I don't know of any way to do it at runtime. I think you can disable NX at boot by passing the option noexec=off to the kernel. If you use grub, you can...
Can someone help me at all please (I've looked in the 'files' section, and also can't see an obvious FAQ, but...) I want to verify primality of a few PRPs (as...
Only if you know 33% of the factors of N-1 or N+1. You can use KP if you know 30% of the factors, and CHG if you know >25% (or perhaps 26% in practice)....
... Hi (once again) Greg, and thanks for your help. I successfully d/led pfgw_ver_12_linux (from the other/user group) and also got it running in an old(er)...
... Primo 3.0.6 is artificially capped at 3000 decimal digits. You will have to look for the 2.3.3 somewhere on the web. /wink-wink/ ... try the Files section...
Hi Serge, Thanks for your email/post - sounds fun, what you're up to!! :) Mine are from: http://www.research.att.com/~njas/sequences/A057468 and I'm now on the...
Where is the current source for PFGW? The only source in the group is for the version using the v23 Woltman libraries. The newer executable (the one...
Mark & all, I have ample free time (been sick, but getting better now) and am willing to help / work to put together the appropriate Linux versions. (32 bit...
Hello fellow group members, After a long time I rear my head by posting a proof for a Wagstaff number primality test. This test is similar to the well known...
... This would be better on the primenumbers list. ... "Consider an element w ... that has no solution w^k == 1" is meaningless. Skipping everything before it,...
... 1) As Phil noted, there is horrific garbling of the meaning of "order". 2) The use of "i" for sqrt(-1) is meaningless, since W_p = 3 mod 4. 3) Anton has...
... I meant that there is no such "i" in Z_{W_p}. In Z_{W_p}[sqrt(2)], we make take i = 2^((p-1)/2)*sqrt(2), so that i^2+1 = 3*W_p = 0 mod W_p. David...
I have had no contact from anyone with access to the source built on the v24 gwnum library. Jim Fougeron has not answered any e-mails so I don't know if he is...
Thank you Phil and thank you David for pointing out my mistakes I cannot transfer to the other forum as my privallages are not enough to upload files. Instead...
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