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Search: Posts Made By: paulunderwood
Forum: Miscellaneous Math 2021-01-24, 22:34
Replies: 2
Views: 247
Posted By paulunderwood
Back in 2003, we tested with at least 5...

Back in 2003, we tested with at least 5 miller-rabin rounds for x<223,490,000,000. Still no proof forthcoming.

A lot of what I wrote in the OP was complete rubbish, :redface:
Forum: Riesel Prime Search 2021-01-22, 02:17
Replies: 234
Views: 35,168
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: 692
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: 2
Views: 247
Posted By paulunderwood
Lightbulb 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: 650
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: 1,651
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: 650
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: 455
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...
Forum: And now for something completely different 2021-01-14, 08:21
Replies: 241
Views: 33,392
Posted By paulunderwood
Congrats on a top5000 prime (which requires...

Congrats on a top5000 prime (which requires generic modular reduction).
Forum: And now for something completely different 2021-01-14, 01:21
Replies: 2
Views: 223
Posted By paulunderwood
it's back! :smile:

it's back! :smile:
Forum: Viliam Furik 2021-01-13, 01:04
Replies: 17
Views: 364
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: 243
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: 243
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...
Forum: And now for something completely different 2021-01-03, 08:23
Replies: 36
Views: 11,678
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...
Forum: And now for something completely different 2021-01-03, 07:33
Replies: 36
Views: 11,678
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: 310
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: 3,509
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: 61
Views: 2,001
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: 1,246
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: 34,421
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...
Forum: And now for something completely different 2020-12-25, 02:11
Replies: 36
Views: 11,678
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: 61
Views: 2,001
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: 1,671
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: 1,671
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: 952
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.
Showing results 1 to 25 of 1000

 
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