mersenneforum.org > Data Thinking out loud about getting under 20M unfactored exponents
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 2021-01-04, 01:14 #331 petrw1 1976 Toyota Corona years forever!     "Wayne" Nov 2006 Saskatchewan, Canada 107138 Posts Odd Comm message Code: [Comm thread Jan 3 15:39] Updating computer information on the server [Comm thread Jan 3 15:39] Done communicating with server. [Comm thread Jan 3 18:32] Sending result to server: UID: petrw1/Speck, M41791891 completed P-1, B1=1000000, B2=30000000, Wi4: 38F4559E [Comm thread Jan 3 18:32] [Comm thread Jan 3 18:32] PnErrorResult value missing. Full response was: [Comm thread Jan 3 18:32] [Jan 3 18:32] Visit http://mersenneforum.org for help. [Comm thread Jan 3 18:32] Will try contacting server again in 70 minutes. Result does show up in my results at 18:32
 2021-01-04, 02:37 #332 Prime95 P90 years forever!     Aug 2002 Yeehaw, FL 3·11·223 Posts 30.4 build 5 released. Please post new comments about version 30.4 (any build) to this thread: https://www.mersenneforum.org/showth...252#post568252 We know return this thread to its normal function of finding lots of new factors. Thanks again for everyone's help.
 2021-01-08, 13:02 #333 firejuggler     Apr 2010 Over the rainbow 2×5×11×23 Posts Taking 27.1M for a spin. Started 5 days ago, I got some good result last night Code: . [Fri Jan 8 04:03:01 2021] P-1 found a factor in stage #2, B1=1350000, B2=89100000. UID: firejuggler/Maison, M27152453 has a factor: 214211625581311913643047 (P-1, B1=1350000, B2=89100000) [Fri Jan 8 05:29:00 2021] P-1 found a factor in stage #1, B1=1350000. UID: firejuggler/Maison, M27153151 has a factor: 4694191350737025517407343 (P-1, B1=1350000) [Fri Jan 8 06:41:42 2021] P-1 found a factor in stage #1, B1=1350000. UID: firejuggler/Maison, M27153359 has a factor: 26637694127747536479168769 (P-1, B1=1350000) 3 factors found, on the same computer, on the same night.
2021-01-08, 15:13   #334
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

107138 Posts

Quote:
 Originally Posted by firejuggler Taking 27.1M for a spin. Started 5 days ago, I got some good result last night Code: . [Fri Jan 8 04:03:01 2021] P-1 found a factor in stage #2, B1=1350000, B2=89100000. UID: firejuggler/Maison, M27152453 has a factor: 214211625581311913643047 (P-1, B1=1350000, B2=89100000) [Fri Jan 8 05:29:00 2021] P-1 found a factor in stage #1, B1=1350000. UID: firejuggler/Maison, M27153151 has a factor: 4694191350737025517407343 (P-1, B1=1350000) [Fri Jan 8 06:41:42 2021] P-1 found a factor in stage #1, B1=1350000. UID: firejuggler/Maison, M27153359 has a factor: 26637694127747536479168769 (P-1, B1=1350000) 3 factors found, on the same computer, on the same night.

 2021-01-12, 20:07 #335 seatsea   Jan 2021 210 Posts Hey all! Newbie to GIMPS here, been spending probably way to much time reading up and messing around with the tools over the last few days. I ended up finding this thread and started testing things at M16.34 I'm currently running mfakto and going from bit level 69 to 70 on that range, is that appropriate? In any case I've just found a first factor! Code: found 1 factor for M16341833 from 2^69 to 2^70 (partially tested) [mfakto 0.15pre7-MGW cl_barrett15_71_gs_2] tf(): total time spent: 2m 8.875s (1880.09 GHz-days / day)
2021-01-12, 23:30   #336
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

5·911 Posts

Quote:
 Originally Posted by seatsea Hey all! Newbie to GIMPS here, been spending probably way to much time reading up and messing around with the tools over the last few days. I ended up finding this thread and started testing things at M16.34 I'm currently running mfakto and going from bit level 69 to 70 on that range, is that appropriate? In any case I've just found a first factor! Code: found 1 factor for M16341833 from 2^69 to 2^70 (partially tested) [mfakto 0.15pre7-MGW cl_barrett15_71_gs_2] tf(): total time spent: 2m 8.875s (1880.09 GHz-days / day)
Yes that's a good range.
Any that are over 1999 unfactored; under 50,000,000 and not assigned to anyone else are the best choices for this project.

 2021-01-30, 01:43 #337 petrw1 1976 Toyota Corona years forever!     "Wayne" Nov 2006 Saskatchewan, Canada 10001110010112 Posts Is there an easy way to look for TF candidates.... Not sure if this is the right place to ask where those who know will see it and answer. Anyway, as most are aware in this sub-project I am factoring to get 100K ranges under 2000 unfactored. Yes, I know I am already well below the DC wavefront and some see no benefit it this work but alas I proceed. As I understand it, (correct me if I'm wrong), once a PRP-(xx??) test is done and verified/certified it can indicate if the remaining factor is a Probable-Prime. I take this to mean it is a waste of time (or a bigger waste of time) to bother looking for factors of these exponents. Am I making sense? Anyway, if I am on the right track then I would like to know if there is an easy way to select a list of exponents to factor (TF or P1 or ECM) that are NOT PRP. Thanks.
 2021-01-30, 01:56 #338 firejuggler     Apr 2010 Over the rainbow 2·5·11·23 Posts the line is PRPDC=N/A,1,2,10014791,-1,99,0,3,5,"50474546641" and will most likelly end with a 'not prime' 10M seem to be the wavefront for cofactor checking. And each check at that range take me around 1H30 min Attached Thumbnails   Last fiddled with by firejuggler on 2021-01-30 at 02:00
2021-01-30, 02:10   #339
axn

Jun 2003

4,861 Posts

Quote:
 Originally Posted by petrw1 As I understand it, (correct me if I'm wrong), once a PRP-(xx??) test is done and verified/certified it can indicate if the remaining factor is a Probable-Prime. I take this to mean it is a waste of time (or a bigger waste of time) to bother looking for factors of these exponents. Am I making sense?
I am not sure I understand you correctly. Could you explain further with an example?

2021-01-30, 02:58   #340
James Heinrich

"James Heinrich"
May 2004
ex-Northern Ontario

CC716 Posts

Quote:
 Originally Posted by petrw1 I would like to know if there is an easy way to select a list of exponents to factor (TF or P1 or ECM) that are NOT PRP.
There are 350 exponents that are fully-factored (where the last factor is either certainly or probably prime).
All the other exponents (almost?) certainly have factors waiting to be discovered.

 2021-01-30, 03:45 #341 masser     Jul 2003 wear a mask 1,553 Posts If an exponent does not correspond to a Mersenne prime, then that exponent corresponds to a composite Mersenne number. If it's composite, it has a factor. When a factor, f, is found for a Mersenne number, Mp = 2^p-1, we can check if the cofactor, (2^p-1)/f is a probable prime. The PRP-cofactor effort is the search for these large PRP cofactors. That search has essentially two stages: 1) Find a factor for a composite Mp and 2) Test the cofactor for probable-primality. If stage 2 has a negative result (not PRP), repeat steps 1) and 2) to find the next factor, cofactor pair. The under-2000 search is helping the PRP-cofactor effort by finding the first factor for A LOT of known composite Mersenne numbers. Does that make sense?

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