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Search: Posts Made By: paulunderwood
Forum: And now for something completely different 2022-11-28, 22:27
Replies: 193
Views: 43,664
Posted By paulunderwood
There was no animosity intended. I was merely...

There was no animosity intended. I was merely conveying how much I admire Robert's work that is corn.c, and agreeing with him that the error is most likely with GMP's mpn/mu_div_qr.c somewhere. That...
Forum: And now for something completely different 2022-11-28, 20:55
Replies: 193
Views: 43,664
Posted By paulunderwood
Of course I am using your corn.c. I'd be a fool...

Of course I am using your corn.c. I'd be a fool not to utilize the huge speed up.

I had R86453 fail with this error...
Forum: And now for something completely different 2022-11-28, 19:16
Replies: 193
Views: 43,664
Posted By paulunderwood
https://primes.utm.edu/top20/page.php?id=67 was...

https://primes.utm.edu/top20/page.php?id=67 was used as a source, not OEIS.
Forum: And now for something completely different 2022-11-28, 19:06
Replies: 193
Views: 43,664
Posted By paulunderwood
This is Enge's ecpp-mpi program.

This is Enge's ecpp-mpi program.
Forum: And now for something completely different 2022-11-28, 18:49
Replies: 193
Views: 43,664
Posted By paulunderwood
The same error has occurred at Size [2]. Where is...

The same error has occurred at Size [2]. Where is this bug?

Taking W127031.
Forum: And now for something completely different 2022-11-28, 08:03
Replies: 193
Views: 43,664
Posted By paulunderwood
This number failed at Size [8] 215618 bits with:...

This number failed at Size [8] 215618 bits with: mu_div_qr GNU MP assertion failed cy == 0.

I am now attempting to certify the cofactor of M221509 (prp66673).
Forum: And now for something completely different 2022-11-27, 19:51
Replies: 209
Views: 22,943
Posted By paulunderwood
Thanks Robert. The only thing I had to do...

Thanks Robert. The only thing I had to do differently to your instructions was to use

#include "/home/paul/Downloads/gmp-6.2.1/gmp-impl.h"

I am looking forward to seeing a nice speed up in...
Forum: Miscellaneous Math 2022-11-27, 16:47
Replies: 22
Views: 1,384
Posted By paulunderwood
As with "-12" (GCD-less probably because the...

As with "-12" (GCD-less probably because the discriminant of at r=znorder(Mod(-12,n)) is 1+48, a square) compared to "12", and comparing "-3" to "3" -- the latter needing GCD depending on whether n...
Forum: Miscellaneous Math 2022-11-27, 01:04
Replies: 22
Views: 1,384
Posted By paulunderwood
Hah, I made a complete blunder. The conclusion is...

Hah, I made a complete blunder. The conclusion is 1=1. I have marked it with a red X.
Forum: Miscellaneous Math 2022-11-26, 17:05
Replies: 22
Views: 1,384
Posted By paulunderwood
Partial proof

For a basis we know prime \(p\) that \(x^{p+1} \equiv -3 \pmod{n, x^2-3^rx-3}\) where the Jacobi symbol of the discriminant is \(-1\).

Now suppose \(n=pq\) where \(q>1\) not necessarily prime.
...
Forum: Miscellaneous Math 2022-11-26, 10:17
Replies: 22
Views: 1,384
Posted By paulunderwood
partial results

The GCD-less test for "-12" was verrified using Par/GP my forumite mart_t and me up to 1.2*10^12.

The test for "-3" has now reached 10^12 using GMP+primesieve. It will take a couple of Celeron CPU...
Forum: And now for something completely different 2022-11-25, 20:45
Replies: 209
Views: 22,943
Posted By paulunderwood
Looking at the source for lib/nt.c I see: ...

Looking at the source for lib/nt.c I see:

unsigned long int cm_nt_next_prime (const unsigned long int n)
/* returns the prime following n */

{
static bool init = true;
#ifdef WITH_MPI...
Forum: And now for something completely different 2022-11-25, 05:06
Replies: 193
Views: 43,664
Posted By paulunderwood
Done: Certified and registered at The Prime Pages...

Done: Certified and registered at The Prime Pages (https://primes.utm.edu/primes/page.php?id=134576) and factorDB.

Reserving the M216317 cofactor (https://www.mersenne.ca/exponent/216317)...
Forum: Data 2022-11-25, 04:57
Replies: 592
Views: 129,628
Posted By paulunderwood
I have just made a submission to The Prime Pages...

I have just made a submission to The Prime Pages and uploaded the certificate do factorDB for the M174533 cofactor (https://primes.utm.edu/primes/page.php?id=134576). :flex:
Forum: And now for something completely different 2022-11-24, 00:42
Replies: 209
Views: 22,943
Posted By paulunderwood
I have had a dreaded "*** No suitable curve...

I have had a dreaded "*** No suitable curve found!" at about 20k digits of a 52k digit number. Re-running after reboot to see if it happens again. What can I do to remedy it?

Interestingly instead...
Forum: Lounge 2022-11-23, 17:12
Replies: 2,017
RIP
Views: 263,661
Posted By paulunderwood
Wilko Johnson

https://www.theguardian.com/music/2022/nov/23/wilko-johnson-obituary

A great punk era inspiring guitarist!

Yp2DvPKh118
Forum: mersenne.ca 2022-11-23, 14:09
Replies: 973
Sticky: mersenne.ca
Views: 137,956
Posted By paulunderwood
Thanks for testing. Rebooting my router seems to...

Thanks for testing. Rebooting my router seems to hve fixed the issue. :tu:
Forum: mersenne.ca 2022-11-23, 14:00
Replies: 973
Sticky: mersenne.ca
Views: 137,956
Posted By paulunderwood
504

I am getting 504 Gateway Time-out on https://www.mersenne.ca/prp.php :down:
Forum: And now for something completely different 2022-11-22, 02:39
Replies: 209
Views: 22,943
Posted By paulunderwood
It should be #include <gmp.h> and not #include...

It should be #include <gmp.h> and not #include "gmp.h". Does this change fix your problem?
Forum: And now for something completely different 2022-11-21, 22:35
Replies: 209
Views: 22,943
Posted By paulunderwood
For GMP have you either installed libgmp-dev...

For GMP have you either installed libgmp-dev (debian based systems) or ./configure && make && make check && sudo make install in the GMP directory? With either of these ways compiling with #include...
Forum: PrimeNet 2022-11-21, 19:27
Replies: 24
Views: 1,014
Posted By paulunderwood
Do the math: core count times GHz, and compare. ...

Do the math: core count times GHz, and compare.
"
I think lower "time" is better.
Forum: PrimeNet 2022-11-21, 19:19
Replies: 24
Views: 1,014
Posted By paulunderwood
Could this laptop of yours be TDP limited? That...

Could this laptop of yours be TDP limited? That might be what's happening.
Forum: Information & Answers 2022-11-21, 18:37
Replies: 1
Views: 377
Posted By paulunderwood
Your computer has had 1 Gerbicz EDAC (Error...

Your computer has had 1 Gerbicz EDAC (Error detection and correction), Things are rosy.

Install some temperature measuring software. Things to watch out for are:


temperature
voltage
...
Forum: Miscellaneous Math 2022-11-21, 06:51
Replies: 22
Views: 1,384
Posted By paulunderwood
I fixed a few things in the paper that were...

I fixed a few things in the paper that were mistakes.

A GMP+primesieve program is now running here. It is much faster tha the Pari/GP one.

I posted on Math.StackExchange but the thread was...
Forum: Miscellaneous Math 2022-11-20, 05:34
Replies: 22
Views: 1,384
Posted By paulunderwood
Here is a short paper about this Lucas(n,3^r,-3)...

Here is a short paper about this Lucas(n,3^r,-3) test.

Now I have to get into coding up a verification program written with GMP+primesieve. Pari/GP is too slow for the purpose.

As I say in the...
Showing results 1 to 25 of 1000

 
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