20201217, 21:33  #232 
"Oliver"
Sep 2017
Porta Westfalica, DE
439 Posts 
I'd be willing to implement a script for finding known factors of mostly Mersenne numbers, at least (if they were found by P1 or ECM).
@James et al., could you compile a list of those factors? Not all of them, but some? Edit 1: The script should create worktodo.txt entries and then I'll be running them. @George, do we have to test different machines or is it sufficient to test on a single machine, when assuming the big number arithmetic itself is rock solid? Edit 2: I may have forgotten; how to specify Sigma when executing ECM with Prime95 or mprime? Last fiddled with by kruoli on 20201217 at 21:38 Reason: Additional information. 
20201217, 22:49  #233 
Jul 2003
wear a mask
1,553 Posts 

20201217, 22:54  #234 
Dec 2016
56_{10} Posts 

20201217, 22:55  #235 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
5×911 Posts 

20201217, 23:18  #236  
P90 years forever!
Aug 2002
Yeehaw, FL
17×433 Posts 
Pfactor and P1 are the same (in both existing and 30.4 versions). The only difference is Pfactor computes the P1 bounds based on expected #LL tests saved, Pminus1 uses user specified bounds.
30.4 will prefer you use this format for your P1 work: Pminus1=1,2,n,1,B1,B2_which_will_be_ignored,TF_sieve_depth This is different than what is displayed on the James' "poorly factored" page. Quote:
The change to FFT code is an assembly implementation of (a+b)*c and (ab)*c using less memory bandwidth. I only implemented this for AVX, FMA3, and AVX512  for older machines that operation is emulated. Let me make a few more tweaks and tests, then I'll build a Windows and Linux executable. 

20201217, 23:24  #237 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2·3^{2}·521 Posts 
I am willing to run it on a couple of Win64 machines.

20201218, 04:36  #238  
Romulan Interpreter
Jun 2011
Thailand
5^{2}×7×53 Posts 
Quote:
I'm in holiday next week, and not going anywhere (moving the rubbish around the house from here to there and back, etc.) Last fiddled with by LaurV on 20201218 at 04:38 

20201218, 12:59  #239 
Banned
"Luigi"
Aug 2002
Team Italia
3×1,601 Posts 

20201218, 13:58  #240 
Apr 2010
Over the rainbow
2×5×11×23 Posts 
Might I suggest 32148013 as one of the PM1 test?
B1=451 519 /B2= 2 846 113 This ought to find a composite 172 bit factor (2) 
20201218, 15:37  #241 
Sep 2002
Oeiras, Portugal
2^{3}×181 Posts 
@george: count me in. Win 10 64bit on a kaby lake 16 GB machine, and Linux on several Colab instances.

20201218, 22:48  #242 
P90 years forever!
Aug 2002
Yeehaw, FL
17×433 Posts 
Warnings:
1) Resuming stage 2 P1 or ECM from a v30.3 save file will not work. Stage 2 will start again from scratch. 2) I've not tested resuming from a P1 v30.3 save file. It is supposed to work, but may not due to substantial changes in save files. Report a bug if you encounter an error. I recommend installing v30.4 in a new directory and copying over your prime.txt, local.txt, worktodo.txt and save files. Thanks for your help in locating bugs or suggestions for more improvements. Win64 version: https://www.dropbox.com/s/ilw7k3x3om...win64.zip?dl=0 Linux64 soon. P.S. Calculating optimal B2 for P1 and ECM is based upon estimates of the work involved in B1 and B2. If there are bugs in the cost estimating code, wrong optimal B2 will be calculated. Thus, if you find a "head scratcher" such as "B2 is faster with 6GB of memory than with 8GB" please report your observations. 
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