20210103, 04:04  #507 
Romulan Interpreter
Jun 2011
Thailand
22073_{8} Posts 
Grrr... man, don't use that HDD anymore! Just scrap it and you will save yourself a lot of headache in the future. Trust me, I destroyed more than 14 HDDs in my "career", only in computers that I owned and used at home (including thunderstrucked HDD, I think I told this story).
I could redownload all the important data for "just in case", if you resend me the link (last sync was sometimes mid of the last year, like 3 or 4 GB all the factors to 10G, iirc). I will also contribute a little bit toward you buying a new HDD (check with Mike). Last fiddled with by LaurV on 20210103 at 04:06 
20210103, 12:53  #508 
"James Heinrich"
May 2004
exNorthern Ontario
6306_{8} Posts 
I guess I should have been clearer, to me it was obvious that that HDD's useful life is over. I had actually already been considering replacing that drive with a newer/larger one for space reasons, so as soon as I found a problem I clicked "order". The replacement should be here in a few days.
To be clear, this is a HDD in my home system (not the server), and all the data is replicated on a second machine so there is little danger of data loss. The interesting bits of data are packaged up for export every Sunday morning on the export page (I haven't packaged up the 2020 data yet but will soon). edit: 2020 archives are now finalized Last fiddled with by James Heinrich on 20210103 at 13:42 
20210112, 23:14  #509 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
2·3^{2}·11·23 Posts 
Another factor missed by P1 in 2008

20210210, 06:52  #510 
"Seth"
Apr 2019
251 Posts 
I was looking at https://www.mersenne.ca/tjaoi.php
If it's not a hard query it would be interesting to know how many number (maybe even in each bit range) where TJAOI has found the only factor. If that's easy then additionally GHz saved over all exponents where TJAOI has found the singular factor. 
20210210, 15:44  #511 
"James Heinrich"
May 2004
exNorthern Ontario
110011000110_{2} Posts 

20210211, 07:21  #512 
Romulan Interpreter
Jun 2011
Thailand
5^{2}·7·53 Posts 
Last similar "argument" raised by me some time ago had the result, someone posted a list of 5 (?) such factors, from which, after some investigation, only 1 or 2 were "new TF", the rest were found by ECM or were not "first factor", or were not "new". He found a lot of "second" and "third" and "so on" factors, I mean A LOT, but didn't factor many exponents which had no known factor before. I mean, by TF. As he worked the lower bitlevels "by q", or "by k" (it is still unsettled how he did it, but it is clear he didn't do it "by p"), any "new" factor he would have found below 66 bits (he surpassed the 65 bits boundary, I think, and still raising slowly) would mean a factor "missed" by GIMPS. There are not many of those.

20210211, 17:15  #513  
"James Heinrich"
May 2004
exNorthern Ontario
2×3×5×109 Posts 
Quote:
Code:
SELECT *, COUNT(*) AS `howmany` FROM `prime_numbers_0` WHERE (`exponent` IN ( SELECT `exponent` FROM `primenet_results_archive_2013` JOIN `primenet_results_archive_users` USING (`primenet_results_user_id`) WHERE (`primenet_results_archive_users`.`user_name` = "TJAOI"))) GROUP BY `exponent` ASC HAVING (`howmany` > 1); 

20210211, 20:01  #514  
"Viliam FurÃk"
Jul 2018
Martin, Slovakia
390_{10} Posts 
Quote:
By my guesstimates, there should be roughly 500 such exponents. 

20210211, 20:33  #515  
"James Heinrich"
May 2004
exNorthern Ontario
2×3×5×109 Posts 
Quote:
Now it returns more sane values Code:
SELECT `exponent`, `timestamp_found` FROM `known_factors_0` WHERE (`exponent` IN (SELECT `exponent` FROM `primenet_results_archive_2021` JOIN `primenet_results_archive_users` USING (`primenet_results_user_id`) WHERE (`result_type` = "F") AND (`primenet_results_archive_users`.`user_name` = "TJAOI"))) GROUP BY `exponent` ASC HAVING (COUNT(*) = 1); Quote:
Note that this is not quite the same question as looking for where TJAOI found the first known factor and someone else may have subsequently found another factor (or, indeed, TJAOI found a second factor for the same exponent). I have not looked for these but I suspect there won't be many. Last fiddled with by James Heinrich on 20210211 at 20:35 

20210216, 03:39  #516 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
2·3^{2}·11·23 Posts 
Is the source code for prob.php available?
I found the source code quite easily about 3 years ago but either, I've gone braindead or it's not as accessible as it used to be.
I believe the formulas have changed because the percentages are not the same as they used to be. I'd like to try to translate the basic calculation into an Excel macro to help me determine the best bounds to use for large blocks of P1 assignments. Thanks 
20210216, 04:12  #517 
"James Heinrich"
May 2004
exNorthern Ontario
2·3·5·109 Posts 
The P1 probability code was redesigned by Mihai Preda in 2020Aug.
His original code was, at the time, posted on https://github.com/preda/gpuowl/tree/master/pm1/ but I no longer see the file there that I used. I think I remember something about Mihai including a PM1 probability calculator utility with gpuowl so you might want to look into that (I could be mistaken). I have attached my PHP version of Mihai's code, I'm not sure how easily it translates to Excel. 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Small inconsistencies between mersenne.org and mersenne.ca factor databases  GP2  mersenne.ca  44  20160619 19:29 
mersenne.ca (ex mersennearies.sili.net)  LaurV  mersenne.ca  8  20131125 21:01 
GaussianMersenne & EisensteinMersenne primes  siegert81  Math  2  20110919 17:36 
Mersenne Wiki: Improving the mersenne primes web site by FOSS methods  optim  PrimeNet  13  20040709 13:51 