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 Showing results 1 to 25 of 1000 Search took 0.40 seconds. Search: Posts Made By: paulunderwood
 Forum: Riesel Prime Search 2020-10-30, 22:13 Replies: 213 Views: 27,429 Posted By paulunderwood Congrats to Scott Brown for the "321+" prime,... Congrats to Scott Brown for the "321+" prime, 3*2^16408818+1 (https://primes.utm.edu/primes/page.php?id=131362), which was 6.5 years in the making by PrimeGrid. :banana:
 Forum: Lounge 2020-10-30, 21:13 Replies: 55 Views: 913 Posted By paulunderwood If it seems more stable yet fails after a few... If it seems more stable yet fails after a few days you might need to add a tiny amount of voltage say 0.02v. Time will tell. If on the other hand it is stable for a week you could try dropping the...
 Forum: Lounge 2020-10-30, 11:52 Replies: 55 Views: 913 Posted By paulunderwood Usually "tuning" hardware involves temperature,... Usually "tuning" hardware involves temperature, timing or voltage. You have ruled out the first two and maybe it time to try the third, for both the memory and the CPU. Maybe try adding a tiny amount...
 Forum: ONeil 2020-10-23, 08:57 Replies: 28 Views: 529 Posted By paulunderwood It is of absolutely no use in reading in a list... It is of absolutely no use in reading in a list of factors. The factors of Mersenne numbers with prime exponents is disjoint: a prime dividing one Mp will not divide another Mq. Reading in from...
 Forum: ONeil 2020-10-23, 08:07 Replies: 28 Views: 529 Posted By paulunderwood https://www.w3schools.com/python/python_sets.asp... https://www.w3schools.com/python/python_sets.asp shows how to use sets in python. So you write something like: known_mersenne_primes = {2, 3, 5, 7, 13, 17, 19, 31, 61, 89, 107, 127, 521, 607,...
 Forum: ONeil 2020-10-23, 00:34 Replies: 28 Views: 529 Posted By paulunderwood Learn to program. Get yourself an elementary book... Learn to program. Get yourself an elementary book on Python. I do not know Python. It does have set membership and arrays. I guess Python, like may other languages, requires you to open the file...
 Forum: Miscellaneous Math 2020-10-22, 13:46 Replies: 6 Views: 210 Posted By paulunderwood ./pfgw64 -tp -q"10^10000 - 10^8668 - 1" -T4 ... ./pfgw64 -tp -q"10^10000 - 10^8668 - 1" -T4 PFGW Version 4.0.1.64BIT.20191203.x86_Dev [GWNUM 29.8] Primality testing 10^10000 - 10^8668 - 1 [N+1, Brillhart-Lehmer-Selfridge] ...
 Forum: ONeil 2020-10-22, 08:31 Replies: 9 Views: 222 Posted By paulunderwood Your code sux. Why not input the exponent? Why a... Your code sux. Why not input the exponent? Why a huge if then else construct -- doesn't python have set inclusion? At least loop over an array. You do not use the structure of Mersennes with prime...
 Forum: Lounge 2020-10-22, 03:24 Replies: 53 Views: 1,337 Posted By paulunderwood Assuming you are using the latest Prime95, a... Assuming you are using the latest Prime95, a certificate will be generated and that will be uploaded to the server. Then your computer will start the next task, be that cached or downloaded from the...
 Forum: EdH 2020-10-22, 02:41 Replies: 14 Views: 304 Posted By paulunderwood That most likely a legacy dot file -- beginning... That most likely a legacy dot file -- beginning with "." -- in your home directory. I think is a security one. ls -a with show it. I am pretty sure if you created a new user with adduser then that...
 Forum: EdH 2020-10-22, 02:13 Replies: 14 Views: 304 Posted By paulunderwood If this question was aimed at me... My apt... If this question was aimed at me... My apt package manager is also broken with unmet dependencies, something to do with dkms and a kernel. I have spent many hours trying to fix apt in the past and...
 Forum: EdH 2020-10-21, 22:33 Replies: 14 Views: 304 Posted By paulunderwood I have never had any such problems with Debian.... I have never had any such problems with Debian. In fact I will be upgrading from Buster to Bullseye any day soon. Some parts of ROCm require later versions of Python. I simply change the sources...
 Forum: Hardware 2020-10-20, 17:26 Replies: 8 Views: 226 Posted By paulunderwood Try running memtest86+. You might have one or... Try running memtest86+. You might have one or more bad sticks of RAM. Also install a temperature monitoring software.
 Forum: Software 2020-10-18, 14:09 Replies: 25 Sticky: LLR version 3.8.24 released. Views: 3,184 Posted By paulunderwood Speed up for N=2^n-c Fermat's Little theorem states b^(N-1) == 1 mod N for prime N (and gcd(b,N)==1). For N=2^n-c this means for b=3 that 3^(2^n-c-1) == 1 (mod 2^n-c). This can be rewritten as 3^(2^n) == 3^(c+1) (mod...
 Forum: Miscellaneous Math 2020-10-17, 23:57 Replies: 18 Views: 761 Posted By paulunderwood There is now a section on Gaussian primes, but... There is now a section on Gaussian primes, but not mod n. CRT: I find that quite difficult. RSA: I have written that s or t may be chosen to be small for quick encoding or quick decoding...
 Forum: Miscellaneous Math 2020-10-15, 15:48 Replies: 18 Views: 761 Posted By paulunderwood I have tried to correct and clarify the text and... I have tried to correct and clarify the text and arguments as Nick pointed out in the previous post. I have uploaded the latest version -- Oct 15th, 2020 -- to the original post....
 Forum: Lounge 2020-10-14, 12:46 Replies: 7 Views: 1,486 Posted By paulunderwood Prof. Chris Caldwell has offered up Yahoo!... Prof. Chris Caldwell has offered up Yahoo! primenumbers group for administration and moderation. It is a useful comms channel for news about prime numbers and would be a pity to lose it. Is anybody...
 Forum: Lounge 2020-10-14, 05:55 Replies: 7 Views: 1,486 Posted By paulunderwood It is almost gone! It closes down completely Dec... It is almost gone! It closes down completely Dec 15, 2020. https://uk.help.yahoo.com/kb/groups/SLN35505.html :sm88:
 Forum: Software 2020-10-12, 17:35 Replies: 25 Sticky: LLR version 3.8.24 released. Views: 3,184 Posted By paulunderwood I concur: testing a million digit number on an... I concur: testing a million digit number on an i7: v3.8.24: 0.749 ms/it v3.8.21: 0.688 ms/it
 Forum: Miscellaneous Math 2020-10-12, 05:33 Replies: 18 Views: 761 Posted By paulunderwood Thank you very much for taking tome to read the... Thank you very much for taking tome to read the text. I have made some changes to my local copy but will upload after more changes. . I mention it now in the both the paragraph on integers and when...
 Forum: Miscellaneous Math 2020-10-11, 08:40 Replies: 18 Views: 761 Posted By paulunderwood The man in the street with a little interest in... The man in the street with a little interest in primes and testing :grin: Please detail what the errors are so that I can fix them.
 Forum: Miscellaneous Math 2020-10-10, 22:43 Replies: 18 Views: 761 Posted By paulunderwood I have tidied up what I want write about "The... I have tidied up what I want write about "The Fermatian Child". I will refrain from reposting the paper until more input from folks.
 Forum: Miscellaneous Math 2020-10-10, 22:40 Replies: 18 Views: 761 Posted By paulunderwood I have read... I have read https://en.wikipedia.org/wiki/Imaginary_unit What would you say I should write? i is fixed to be one of the two square roots of -1?
 Forum: Miscellaneous Math 2020-10-10, 13:40 Replies: 18 Views: 761 Posted By paulunderwood Prime Numbers Book Enjoy and criticize. It ain't no C&P but might help some. :book: After 20 downloads, I have made the changes to typos and Mersenne data. A new copy is now uploaded. 2 More downloads and I have...
 Forum: Miscellaneous Math 2020-10-06, 00:38 Replies: 106 Views: 10,351 Posted By paulunderwood A slight variation for x^2-y Instead of using base x+1 choose to use base x+2. Then the test is, with any y=2^r-1, for non-square odd n: find jacobi(y,n)==-1 then test 2^(n-1) == 1 (mod n) y^((n-1)/2)==-1 (mod n)...
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