mersenneforum.org Getting others to do the work on exponents I like (was: Trial Factoring Progress)
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2021-11-16, 20:01   #397
tuckerkao

"Tucker Kao"
Jan 2020

563 Posts

Quote:
 Originally Posted by Zhangrc But he might just be interested in finding a factor, which is not the general case.
I trial factored both M168202123 and M168286523 up to 2^84 because I was looking for the specific type of factors to satisfy my personal goal that my father gave to me.

It turned out M168184123 and M168184823 were the correct exponents. F between 2^77 to 2^78 after NF-PM1 with B1=1,000,000 and B2=40,000,000. The other had the result of F-PM1 with a factor larger than 2^100.

Since I already found what I've wanted, I'll trial factor the M168M lists to 2^77, run P-1, then up to 2^79 as the roots. After I finish up the considerable amount of the exponents, then go up to 2^80 or higher if still no prime drops.

Last fiddled with by tuckerkao on 2021-11-16 at 20:12

2021-11-16, 21:55   #398
chalsall
If I May

"Chris Halsall"
Sep 2002

2·5,021 Posts

Quote:
 Originally Posted by tuckerkao I trial factored both M168202123 and M168286523 up to 2^84 because I was looking for the specific type of factors to satisfy my personal goal that my father gave to me.
And that's perfectly acceptable.

2021-11-17, 00:13   #399
tuckerkao

"Tucker Kao"
Jan 2020

56310 Posts

Quote:
That was actually my friend's kit. I liked the speed overall, so I purchased a similar one online and expect to arrive early Dec 2021. Tried the first 2 models, not the exact match, the 3rd model had a layout of an ideal speed per price.

Glad I checked 3 different PCs, Nvidia Geforce 3080 Ti was only slightly faster but cost $600 more ($1600). The Geforce 3080 10GB I bought(my father paid it) cost $950 with the$50 discount from the regular price that day.

Last fiddled with by tuckerkao on 2021-11-17 at 00:19

2021-11-17, 02:28   #400
chalsall
If I May

"Chris Halsall"
Sep 2002

2·5,021 Posts

Quote:
 Originally Posted by tuckerkao The Geforce 3080 10GB I bought(my father paid it) cost $950 with the$50 discount from the regular price that day.
If I may... When my Father died, it was like a whole library burned down.

2021-11-19, 03:15   #401
tuckerkao

"Tucker Kao"
Jan 2020

563 Posts

SRBase reserved the exponents up to M162M yesterday, wish he can go a bit higher and faster. Most of the hopeful exponents must pass the checks up to 2^75.

I've finished the trial factoring of 2^73 to 2^74 for most of the exponents between M168,189,000 to M168,190,000, so they won't be locked down for at least a week -
https://www.mersenne.org/report_expo...8190000&full=1

Quote:
 Originally Posted by chalsall If I may... When my Father died, it was like a whole library burned down.
However it's a reality that everyone will pass away at a certain time. Older people leave the Earth and younger babies arrive to continue the genealogy.

Last fiddled with by tuckerkao on 2021-11-19 at 03:36

 2021-11-19, 10:57 #402 Dobri   "刀-比-日" May 2018 ED16 Posts Out of only 11 palindromic prime exponents in the 168,xxx,xxx range (M168151861, M168191861, M168232861, M168404861, M168505861, M168515861, M168565861, M168818861, M168898861, M168929861, and M168949861), for just one (M168929861) the corresponding Mersenne number resists factorization so far. It is nice to see that tuckerkao started TF testing on it too.
2021-11-22, 08:00   #403
tuckerkao

"Tucker Kao"
Jan 2020

563 Posts

Quote:
 Originally Posted by Dobri Out of only 11 palindromic prime exponents in the 168,xxx,xxx range, for just one (M168929861) the corresponding Mersenne number resists factorization so far. It is nice to see that tuckerkao started TF testing on it too.
Running trial factoring tasks using mfaktc(Nvidia GPU) or mfakto(AMD Radeon GPU) takes more experience than the P-1 in Prime95.

For every assignment, the user has to type in a command line such as "Factor=168173549,75,77" in worktodo.txt, then manually submit the result from results.txt to the Mersenne server using https://www.mersenne.org/manual_result/.

mfaktc reads "Factor=168173549,75,77" as to run the trial factoring task for M168173549 from 275 to 277

Also accidental click on the command console can disrupt the trial factoring, so best to minimize it once it has started without the issues.

Download page of the GPU trial factoring application - https://download.mersenne.ca/mfaktc/mfaktc-0.21, cudart64_100.dll will also be required to placed in the same directory as mfaktc.

Last fiddled with by tuckerkao on 2021-11-22 at 08:06

 2021-11-25, 09:29 #404 tuckerkao   "Tucker Kao" Jan 2020 Head Base M168202123 563 Posts Dobri indeed hit an exponent with NF-PM1, then a factor was found from the trial factoring of the highest bit level, unfortunately the PRP test was finished first on M140419663, thus no GHz Days were saved. I already fully prepared M168285323, in case Dobri needs an exponent to run the PRP test. Last fiddled with by tuckerkao on 2021-11-25 at 09:32
2021-11-25, 11:05   #405
Dobri

"刀-比-日"
May 2018

3·79 Posts

Quote:
 Originally Posted by tuckerkao Dobri indeed hit an exponent with NF-PM1, then a factor was found from the trial factoring of the highest bit level, unfortunately the PRP test was finished first on M140419663, thus no GHz Days were saved.
Further TF tests were carried out for M140419663 because the PRP test was unsuccessful in generating a CERT file due to a peculiar failure to read from the residues file. Gladly, said TF tests produced a factor.
A similar problem occurred with M129091993 as no CERT file was generated. This was resolved by running a copy of the test files (preserved after reaching 90% of the test) on another computer and successfully generating a CERT file.

2021-11-25, 13:33   #406
tuckerkao

"Tucker Kao"
Jan 2020

563 Posts

Quote:
 Originally Posted by Dobri Further TF tests were carried out for M140419663 because the PRP test was unsuccessful in generating a CERT file due to a peculiar failure to read from the residues file. Gladly, said TF tests produced a factor. A similar problem occurred with M129091993 as no CERT file was generated. This was resolved by running a copy of the test files (preserved after reaching 90% of the test) on another computer and successfully generating a CERT file.
Both exponents should have been trial factored up to at least 277 before running the PRP test. If a factor has been found, that means no PRP test will be needed, it's already a composite number.

Looks like you've encountered the same problems as I did in M168286523, interim residue file reading error. Since the PRP test is very reliable when no Gerbicz errors detected, It's over 99.8% that the result is correct even without the proofs.

 2021-11-26, 09:12 #407 tuckerkao   "Tucker Kao" Jan 2020 Head Base M168202123 56310 Posts I guess that the algorithm Dobri has used seem to land on the exponents with the factors more frequently - M168322477, M168852323, M168999983, it's strongly recommended that her guesses be trial factored up to at least the GPU72 bit levels, perhaps even 1 bit higher if the GPU speed can accommodate. Thanks a lot for ViliamF to work on the additional bits on M168285323, Dobri will feel more confident on running the PRP on it.

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