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Search: Posts Made By: paulunderwood
Forum: Miscellaneous Math 2021-09-18, 14:54
Replies: 2
Views: 44
Posted By paulunderwood
With the counterexample [n, a, t, t2,...

With the counterexample [n, a, t, t2, gcd((t*t2)^2-1,n), gcd(t^2-t2^2,n)] = [5983, 5514, 5512, 5982, 1, 1] it is advisable to take the above GCD giving a non-degenerative Fermat PRP-t test. For this...
Forum: Miscellaneous Math 2021-09-18, 08:37
Replies: 2
Views: 44
Posted By paulunderwood
[Side note: gcd(t^3-t,n)==1 might not be required...

[Side note: gcd(t^3-t,n)==1 might not be required in the above tests.]

I'll try to convey my thinking here.

Let A be the matrix [a,-1;1,0] and its characteristic function be X(A).

Note that...
Forum: Miscellaneous Math 2021-09-18, 04:44
Replies: 2
Views: 44
Posted By paulunderwood
Singleton/Complex/General Tests

Singleton Case - 2 Selfridges
If n = 3 mod 4 then (x+2)^(n+1)==5 (mod n, x^2+1), which has been verified to 2^50.

Complex Case - Double Test - Two Parameters
Only for n==3 mod 4.
Let CT(t,n) =...
Forum: Riesel Prime Search 2021-09-15, 11:19
Replies: 267
Views: 46,710
Posted By paulunderwood
No they are not :no: Reversing the digits does...

No they are not :no: Reversing the digits does not give the same number.

https://primes.utm.edu/primes/page.php?id=132715 is a palindrome. Congrats Serge and Ryan.

UTM's Prime Pages parser...
Forum: Software 2021-09-15, 10:53
Replies: 3
Views: 308
Posted By paulunderwood
I don't know about efforts to put GWNUM in GMP,...

I don't know about efforts to put GWNUM in GMP, but you could write your own functions like

gw_mul( mpz_t r, mpz_t a, mpz_t b ) {
...
}

:smile:
Forum: Riesel Prime Search 2021-09-14, 21:01
Replies: 267
Views: 46,710
Posted By paulunderwood
I am looking forward to its revelation. The...

I am looking forward to its revelation. The largest palindrome before this one had 490,001 digits. So 1,234,567 digits is quite amazing considering its crunching is done with generic modular...
Forum: Riesel Prime Search 2021-09-12, 17:20
Replies: 267
Views: 46,710
Posted By paulunderwood
Congrats to Marc Wiseler and PrimeGrid for the...

Congrats to Marc Wiseler and PrimeGrid for the "321" prime 3*2^17748034-1 (https://primes.utm.edu/primes/page.php?id=132678) (5,342,692 decimal digits) ranked as the 18th largest known prime.
...
Forum: XYYXF Project 2021-09-11, 12:43
Replies: 477
Views: 99,580
Posted By paulunderwood
Although it good to us another library, for...

Although it good to us another library, for numbers of this size you can use the -tc switch of PFGW to get a combined Fermat+Lucas result, which is much quicker.

Congrats for such a huge find.
Forum: Riesel Prime Search 2021-09-11, 08:21
Replies: 267
Views: 46,710
Posted By paulunderwood
Congrats to Serge and Ryan for the two smallest...

Congrats to Serge and Ryan for the two smallest known Mega primes, prove with CHG at 28.7% factored of N+1

10^999999 - 1022306*10^287000 - 1 (https://primes.utm.edu/primes/page.php?id=132705)
...
Forum: Software 2021-09-09, 11:39
Replies: 7
Views: 267
Posted By paulunderwood
That syntax would clash with: You...

That syntax would clash with:



You could always write a GMP program to do this, or even PARI/GP
Forum: Information & Answers 2021-09-09, 11:31
Replies: 3
Views: 143
Posted By paulunderwood
The 64 core TR comprises of 8 chiplets and so it...

The 64 core TR comprises of 8 chiplets and so it is best to run 8 workers at the current wavefront of GIMPS. Forget using Hyper Threading -- only real cores count.
Forum: And now for something completely different 2021-09-07, 10:43
Replies: 11
Views: 7,048
Posted By paulunderwood
Congrats, Peter, for this AP-6. I am looking...

Congrats, Peter, for this AP-6. I am looking forward to your submissions to the UTM top20 and JK Andersen's list.

:party:
Forum: Factoring 2021-09-05, 15:59
Replies: 91
Views: 3,329
Posted By paulunderwood
Did you install with YaST the dev package of...

Did you install with YaST the dev package of libstdc++?
Forum: Puzzles 2021-09-05, 14:24
Replies: 58
Views: 1,458
Posted By paulunderwood
Suppose the farmer has to enclose the roof with...

Suppose the farmer has to enclose the roof with part of the 200m roll of fencing and that roll is 1m wide (and that the wall is 50m high). He may, by doing some simple wood work, run two or more...
Forum: Mlucas 2021-09-05, 02:47
Replies: 4
Views: 457
Posted By paulunderwood
factor found on a73

Yay, I found my first factor using the a73 of my Odroid N2: Found 77-digit factor in Stage 2: 126440940410782170073559 (of M105592247)

Clocks for stage 2 have gone from 00:25:14 (v20) to 00:23:39...
Forum: Factoring 2021-09-05, 02:24
Replies: 91
Views: 3,329
Posted By paulunderwood
Use YaST to search for the dev file of libstdc++...

Use YaST to search for the dev file of libstdc++ and install it (and its dependencies), and then link with -lstdc++
Forum: Factoring 2021-09-04, 17:20
Replies: 91
Views: 3,329
Posted By paulunderwood
Did you install through Yast or a direct download...

Did you install through Yast or a direct download from nVidia?
Forum: Factoring 2021-09-04, 16:58
Replies: 91
Views: 3,329
Posted By paulunderwood
Following this solution...

Following this solution (https://askubuntu.com/questions/1095825/what-does-modprobe-blacklist-nouveau-do) (although Ubuntu)



reboot.

run lsmod | grep nvidia

HTH
Forum: Software 2021-08-30, 19:20
Replies: 3
Views: 186
Posted By paulunderwood
Search for embedding C in Python :google:

Search for embedding C in Python

:google:
Forum: Software 2021-08-29, 01:56
Replies: 432
Views: 45,479
Posted By paulunderwood
I recommended off-forum that Vincent uses Prime95...

I recommended off-forum that Vincent uses Prime95 mainly because there is no 64-bit Windows version of LLR that has GEC (Gerbicz Error Correction). Also Prime95 has the nice worktodo.add service,...
Forum: GpuOwl 2021-08-23, 22:20
Replies: 2,730
Views: 298,078
Posted By paulunderwood
This is probably due to an update. Check your...

This is probably due to an update. Check your paths so that the shared objects are found.

Check clinfo is working.



:tu:
Forum: News 2021-08-22, 00:59
Replies: 18
Views: 867
Posted By paulunderwood
The share becomes part of the local file system...

The share becomes part of the local file system for the stick. With this extension, everything needed to run mprime -- ini, local,, GMP, temp files, proofs mprime -- are all stored on the share. From...
Forum: News 2021-08-22, 00:37
Replies: 18
Views: 867
Posted By paulunderwood
If the server is set up with something like...

If the server is set up with something like /nfs_share/stick1, /nfs_share/stick2 etc then stick machine 1 accesses its share which contains all it needs for running mprime including the executable,
Forum: News 2021-08-22, 00:11
Replies: 18
Views: 867
Posted By paulunderwood
Yes my first suggestion was a too drastic. Since...

Yes my first suggestion was a too drastic. Since you have Peppermint OS installed, why not set up a NFS (https://linuxconfig.org/how-to-configure-nfs-on-linux) to and from an HDD'd machine?
Forum: News 2021-08-21, 23:32
Replies: 18
Views: 867
Posted By paulunderwood
Have you thought about PXE booting SLAX Linux...

Have you thought about PXE booting SLAX Linux from one HDD?
Showing results 1 to 25 of 1000

 
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