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 Showing results 1 to 25 of 419 Search took 0.06 seconds. Search: Posts Made By: bur
 Forum: Data 2021-11-30, 14:40 Replies: 120 Views: 10,465 Posted By bur I was after finding a factor with P+1 and using... I was after finding a factor with P+1 and using the script to come up with candidates and B1 a factor was found today: M211231 (https://www.mersenne.ca/exponent/211231) Start=2/7, B1=150,000,000,...
 Forum: Miscellaneous Math 2021-11-27, 07:53 Replies: 7 Views: 517 Posted By bur Interesting idea, I tried to find an example for... Interesting idea, I tried to find an example for d_s > 6 but there were none up to d_s = 102. I only tested the smallest possible C with that d_s. I did the search manually though as I was too...
 Forum: Homework Help 2021-11-26, 14:32 Replies: 23 Views: 4,101 Posted By bur And another one: Show that {p-1\choose... And another one: Show that {p-1\choose k}\equiv -1^k \pmod p It probably shouldn't use Wilson's theorem since that only comes in the next section in the book. I tried to write it as a...
 2021-11-26, 06:57 Replies: 71 Views: 8,563 Posted By bur To be honest, I also don't get it. The search... To be honest, I also don't get it. The search limit is 10,800,000 but some numbers in the 6-8M range have not been checked yet (or at least it's not documented).
 Forum: Proth Prime Search 2021-11-22, 16:32 Replies: 21 Views: 7,070 Posted By bur Once again, a status update with no new prime: ... Once again, a status update with no new prime: Sieving All n < 10,000,000 have been sieved to 800e12. Last reported time per factor: approx. 12,000 s 76,167 candidates (1.6%) are left in the...
 Forum: Homework Help 2021-11-21, 05:54 Replies: 23 Views: 4,101 Posted By bur I know, I wrote just that... ;) I didn't... I know, I wrote just that... ;) I didn't think of that. But in that case it still only works for powers of 2 as factors. Thanks, this is the answer to my question, but seeing it, I think...
 Forum: Homework Help 2021-11-20, 08:26 Replies: 23 Views: 4,101 Posted By bur Another problem came up. The exercises deal with... Another problem came up. The exercises deal with showing that a^x is congruent to 1 (or a) mod c, where c is a composite number: a^21 == a (mod 15) for all a This is not a problem yet, but what...
 Forum: Data 2021-11-17, 19:00 Replies: 79 Views: 8,923 Posted By bur Old thread, but at least somewhat connected to my... Old thread, but at least somewhat connected to my question: I just got assigned a C-PRP on a number below the wavefront and saw the factor in question should have been found by P-1 20 years ago....
 2021-11-17, 11:28 Replies: 71 Views: 8,563 Posted By bur When looking at the stats... When looking at the stats (https://www.kurtbeschorner.de/#rprimes) I noticed that the ranges 6M-7M and 7M-8M are not yet 100% completed but have a few exponents with status "unknown". Is there a...
 Forum: Data 2021-11-12, 16:39 Replies: 120 Views: 10,465 Posted By bur Ok, thanks. And one more question, this time... Ok, thanks. And one more question, this time hopefully a genuine problem: the script chose various P-1 jobs with B1 smaller than the actual work done. For example M52757...
 Forum: Data 2021-11-11, 11:48 Replies: 120 Views: 10,465 Posted By bur Some more testing revealed that indeed the size... Some more testing revealed that indeed the size of the exponent determines whether or not the worker will run multithreaded. Is that a bug?
 Forum: Data 2021-11-11, 08:38 Replies: 120 Views: 10,465 Posted By bur I have a problem with multithreading. Initially I... I have a problem with multithreading. Initially I was running P+1 with 2 workers on exponents in the 10^6 range and each worker ran 5 threads, fully utilizing the 10-core CPU. Then I added some 50000...
 Forum: Data 2021-11-08, 21:33 Replies: 120 Views: 10,465 Posted By bur Finally figured it out, I had to update to 30.6... Finally figured it out, I had to update to 30.6 ... I tried using the script to get P+1 to run, but I only get "illegal line in worktodo.txt" for each line. Doesn't matter whether I put them...
 Forum: Software 2021-11-06, 06:36 Replies: 304 Views: 68,033 Posted By bur That means it's 5% slower but allows for p up to... That means it's 5% slower but allows for p up to 2^64? So if I don't need such large p, I'd better use the older version? Or is it only slower if you actually use p > 2^52?
 Forum: Math 2021-11-01, 19:28 Replies: 10 Views: 2,259 Posted By bur I know this thread is old, but I couldn't find... I know this thread is old, but I couldn't find any other explanation more detailed than A 41 digits for M14731 (https://www.mersenne.org/report_exponent/?exp_lo=14731&full=1) was found via ECM...
 Forum: Software 2021-10-30, 06:11 Replies: 1 Views: 109 Posted By bur pfgw factorial testing too slow? I had done some factorial prime testing with PRPnet (http://prpnet.primegrid.com:12002/server_stats.html) with i5 and i3 CPUs before and a test took about 25-30 hours. Now recently I began testing...
 Forum: Riesel Prime Search 2021-10-25, 17:34 Replies: 290 Views: 51,596 Posted By bur Thanks for moving the post. Who knows, it's not... Thanks for moving the post. Who knows, it's not like where GIMPS is currently at where 20M+ consecutive candidates are composite - at least I don't think so. I always forget the estimate for...
 Forum: Lone Mersenne Hunters 2021-10-24, 11:56 Replies: 1,985 Views: 271,212 Posted By bur Nothing spectacular, but the first P-1 tests I... Nothing spectacular, but the first P-1 tests I did in a while and the first to finish stage 1 returned: [Worker #3 Oct 24 07:53] P-1 found a factor in stage #1, B1=779000. [Worker #3 Oct 24...
 Forum: Riesel Prime Search 2021-10-22, 17:44 Replies: 290 Views: 51,596 Posted By bur New Primorial Prime found Recently a new -1 type primorial prime was found at PRPNet. 3267113# - 1 (https://primes.utm.edu/primes/page.php?id=132758) It has 1418398 digits, making it the largest known one. The last -1...
 Forum: CADO-NFS 2021-10-22, 17:17 Replies: 72 Views: 14,221 Posted By bur I finished the uniques ratio for a large set of... I finished the uniques ratio for a large set of different q-min/q-max settings. The data is attached as an xslx file, zipped since for some reason the forum software didn't like the file....
 Forum: Factoring 2021-10-18, 16:17 Replies: 60 Views: 4,999 Posted By bur Once again the factoring times increased... Once again the factoring times increased significantly. I'm at 1281979*2^632+1 and the 179 digits co-factor took nearly 24 hours. I used the optimized c140 params as basis with slightl adjustment as...
 Forum: Proth Prime Search 2021-10-11, 07:14 Replies: 6 Views: 1,011 Posted By bur Interesting, I didn't know about Pierpont primes.... Interesting, I didn't know about Pierpont primes. Did you check for ((x)G))F divisibility? The chances are slim, but you never know...
 Forum: Msieve 2021-10-08, 15:46 Replies: 188 Views: 53,932 Posted By bur This c163 poly is close to the record-holder with... This c163 poly is close to the record-holder with cownoise score of 1.081e-12 vs. 1.096e-12. Maybe it can be spun towards a new record? I tried EdH's spin script but it changed nothing. n:...
 Forum: CADO-NFS 2021-10-07, 16:52 Replies: 72 Views: 14,221 Posted By bur Total - Uniques - Duplicates - Ratio 10-100M... Total - Uniques - Duplicates - Ratio 10-100M 214,512,998 - 153,030,781 - 61,482,217 - 71,34% 11-105M 219,448,738 - 158,516,513 - 60,932,225 - 72,23% 12-110M 224,369,197 - 163,859,554 -...
 Forum: Aliquot Sequences 2021-10-06, 06:26 Replies: 136 Views: 46,535 Posted By bur I think it would be a very interesting number... I think it would be a very interesting number since 276 is both the smallest open-ended aliquot-sequence which also makes it part of the Lehmer 5. But since I don't have any means to sieve this it...
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