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 Showing results 1 to 25 of 1000 Search took 0.32 seconds. Search: Posts Made By: paulunderwood
 Forum: Riesel Prime Search 2021-01-22, 02:17 Replies: 230 Views: 34,740 Posted By paulunderwood 321 Congrats to Rudi Tapper and PrimeGrid for the prime 3* 2^16819291 - 1 (https://primes.utm.edu/primes/page.php?id=131595) with 5,063,112 decimal digits and top5000 entrance rank of 21. :banana:
 Forum: Hardware 2021-01-20, 18:06 Replies: 16 Views: 650 Posted By paulunderwood "Calculate large numbers" could mean several... "Calculate large numbers" could mean several things. What do you mean? In what time scale? If it is to do with large primes then you have several options in ascending magnitude: Pari/GP, Perl or GMP...
 Forum: Miscellaneous Math 2021-01-18, 12:54 Replies: 1 Views: 170 Posted By paulunderwood n=x^3-x-1 Let n=x^3-x-1 for x integer >2. In the past I have tested x^n==x mod n => n is prime. Let's start with n=p*q. Note that either p or q is congruent to -1 mod 4 and either p or q is congruent to -1...
 Forum: GPU Computing 2021-01-16, 17:13 Replies: 21 Views: 585 Posted By paulunderwood As has been said, they 8 pin CPU plug is not... As has been said, they 8 pin CPU plug is not interchangeable with the GPU ones. If your board uses only 4 pins for the CPU feed then make sure to get a 4+4.
 Forum: Hardware 2021-01-16, 16:52 Replies: 13 Views: 1,605 Posted By paulunderwood Can you tell me whether the BeagleV will be 32... Can you tell me whether the BeagleV will be 32 bit or 64 bit? Edit; according to https://www.tomshardware.com/news/beaglev-riscv-announced it had a dual core 64 bit U74 CPU.
 Forum: GPU Computing 2021-01-16, 16:39 Replies: 21 Views: 585 Posted By paulunderwood Buy a new capable modern efficient PSU :smile: Buy a new capable modern efficient PSU :smile:
 Forum: PrimeNet 2021-01-15, 11:44 Replies: 12 Views: 423 Posted By paulunderwood LL first tests are double checked. However PRP... LL first tests are double checked. However PRP tests are preferable; Not only is there Gerbicz error checking, a certificate is produced which means only one test is performed -- unless it is PRP...
 2021-01-14, 08:21 Replies: 241 Sticky: Carol / Kynea Primes Views: 33,109 Posted By paulunderwood Congrats on a top5000 prime (which requires... Congrats on a top5000 prime (which requires generic modular reduction).
 2021-01-14, 01:21 Replies: 2 Views: 209 Posted By paulunderwood it's back! :smile: it's back! :smile:
 Forum: Viliam Furik 2021-01-13, 01:04 Replies: 17 Views: 356 Posted By paulunderwood I have never noticed much speed difference when... I have never noticed much speed difference when using GWNUM programs under different operating systems. There is a few percent to gain in throughput by running two instances of gpuOwl.
 Forum: Miscellaneous Math 2021-01-05, 00:31 Replies: 9 Views: 223 Posted By paulunderwood Counting the number of all solutions (including... Counting the number of all solutions (including powers of 2) for p=11, 23, 29 seems to indicate that this count is equal to p^{#factors}.
 Forum: Miscellaneous Math 2021-01-04, 22:53 Replies: 9 Views: 223 Posted By paulunderwood crazy Mersenne test If there exists a non-power of 2, k, such that Mod(k,n)^p==1 then n, a Mersenne number, is composite. E.g. n p=11, k=39; n p=23, k=156171. Is there any quick way to identify a k for a particular...
 2021-01-03, 08:23 Replies: 36 Sticky: Primo reservation thread Views: 11,456 Posted By paulunderwood Hmm, I have just created a second Primo folder... Hmm, I have just created a second Primo folder and am running M-cofactor at niceness 19. I have 128 threads after all. But you seem to be right about top -- I'll monitor the situation for a week or...
 2021-01-03, 07:33 Replies: 36 Sticky: Primo reservation thread Views: 11,456 Posted By paulunderwood It would be a nice feature if Primo showed % done... It would be a nice feature if Primo showed % done and an ETA. Have you experimented with running more than one instance of Primo, maybe at different priorities? There are a lot of free cycles...
 Forum: Riesel Prime Search 2021-01-01, 23:40 Replies: 5 Views: 272 Posted By paulunderwood It is in progress of being verified according to... It is in progress of being verified according to the status page. Most likely it will appear when the search page is used.
 Forum: Lounge 2021-01-01, 00:00 Replies: 46 Views: 3,438 Posted By paulunderwood HNY! May the primes keep being discovered and the... HNY! May the primes keep being discovered and the PRPs be proved. Most of all let there be a new Mersenne prime in 2021
 Forum: Science & Technology 2020-12-31, 18:19 Replies: 49 Sticky: Poll: COVID vaccination wavefront Views: 1,709 Posted By paulunderwood The c:censored:k ups have begun. Despite the... The c:censored:k ups have begun. Despite the tested and recommended dose interval of three weeks by the manufacturer between jabs, the uk tory government playing pseufo-scientists know better and...
 Forum: y-cruncher 2020-12-29, 01:43 Replies: 14 Views: 1,205 Posted By paulunderwood I suggest you email the author -- it is his... I suggest you email the author -- it is his software after all. :smile:
 Forum: Hardware 2020-12-29, 01:03 Replies: 284 Views: 34,195 Posted By paulunderwood Asus R7 defaults: 2020-12-29 00:57:04 GpuOwl... Asus R7 defaults: 2020-12-29 00:57:04 GpuOwl VERSION v7.2-16-g1a50f11-dirty 2020-12-29 00:57:04 GpuOwl VERSION v7.2-16-g1a50f11-dirty 2020-12-29 00:57:04 Note: not found 'config.txt' 2020-12-29...
 2020-12-25, 02:11 Replies: 36 Sticky: Primo reservation thread Views: 11,456 Posted By paulunderwood I am 5.5 months into certifying R49081. Expect... I am 5.5 months into certifying R49081. Expect the result in August or September 2021 assuming all goes well. :xmastree:
 Forum: Science & Technology 2020-12-23, 08:39 Replies: 49 Sticky: Poll: COVID vaccination wavefront Views: 1,709 Posted By paulunderwood Despite the big fanfare photo-opertunity media... Despite the big fanfare photo-opertunity media frenzy at the time of the first jab, only 500,000 people n the UK have had a first jab. This has taken weeks. Only 100 times as many more of the...
 Forum: ONeil 2020-12-20, 19:31 Replies: 49 Views: 1,588 Posted By paulunderwood The chance your exponent will yield non- prime is... The chance your exponent will yield non- prime is non-zero. Good luck. But don't get your hopes up. I presume the M-R test you did was base 2? Again it very foolish to run LL. The chance of a...
 Forum: ONeil 2020-12-20, 19:00 Replies: 49 Views: 1,588 Posted By paulunderwood Why are you not running PRP instead of LL? LL... Why are you not running PRP instead of LL? LL entails twice the work for the server/community. (Everyone) for goodness sake run certifiiable PRP! Ps, looking forward to certifiable mLucas.
 Forum: GPU Computing 2020-12-19, 20:20 Replies: 27 Views: 890 Posted By paulunderwood I use Kali on my second hand EeePC which is 32... I use Kali on my second hand EeePC which is 32 bit, 1 GB RAM, 16 GB solid state drives. I like it although I have yet to use its features. It is a rolling release.
 Forum: GPU Computing 2020-12-19, 13:08 Replies: 27 Views: 890 Posted By paulunderwood I was talking about installing Gentoo from... I was talking about installing Gentoo from scratch! There is now a nice tool (https://wiki.gentoo.org/wiki/Installer) that walks beginners through the engaging installation process.
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