mersenneforum.org  

Go Back   mersenneforum.org > Search Forums

Showing results 1 to 25 of 1000
Search took 0.32 seconds.
Search: Posts Made By: fivemack
Forum: Information & Answers 2020-11-17, 12:43
Replies: 27
Views: 1,159
Posted By fivemack
Did you (or prime.txt) do anything non-obvious...

Did you (or prime.txt) do anything non-obvious with assignment of CPU cores to workers? If the old system was running one worker on 012345 and the other on 6789ab, and that's stayed the same for the...
Forum: Miscellaneous Math 2020-10-22, 13:33
Replies: 6
Views: 389
Posted By fivemack
Using a gigahertz-month of compute for something...

Using a gigahertz-month of compute for something which can sensibly be asserted by inspection would get probably ruder remarks from you and RDS :)

(my housemate had found a tweet getting excited...
Forum: Miscellaneous Math 2020-10-22, 10:47
Replies: 6
Views: 389
Posted By fivemack
Primes made mostly of nines

10^10000 - 10^8668 - 1 is a pseudoprime; can I assert that it's prime because we've got a very boring factorisation of 86.68% of n+1 ?
Forum: NFS@Home 2020-10-16, 08:30
Replies: 12
Views: 1,162
Posted By fivemack
L1510 complete

Fri Oct 16 06:41:07 2020 p93 factor: 768278079468147872006161615793478445262891405249833298882663471356153278846031859145179203921
Fri Oct 16 06:41:07 2020 p112 factor:...
Forum: NFS@Home 2020-10-13, 14:58
Replies: 94
Views: 12,232
Posted By fivemack
L2004 complete

Tue Oct 13 14:12:17 2020 p82 factor: 5723280937158349169817962771791765516670683427993154997001889277215732479450609521
Tue Oct 13 14:12:17 2020 p167 factor:...
Forum: NFS@Home 2020-10-11, 09:28
Replies: 23
Views: 1,321
Posted By fivemack
Thank you so much!

Thank you so much!
Forum: NFS@Home 2020-10-10, 10:16
Replies: 12
Views: 1,162
Posted By fivemack
L1510 linalg started, should be done 16 October...

L1510 linalg started, should be done 16 October evening
Forum: NFS@Home 2020-10-09, 10:11
Replies: 23
Views: 1,321
Posted By fivemack
So, the easiest outstanding Fibonacci quartic is...

So, the easiest outstanding Fibonacci quartic is L2995A; difficulty 250.37

http://factordb.com/index.php?showid=1100000000216955784

...
Forum: NFS@Home 2020-10-09, 10:05
Replies: 23
Views: 1,321
Posted By fivemack
OK, my initial relation-sampling was over too...

OK, my initial relation-sampling was over too small a region; I'm seeing roughly one relation per Q for


n:...
Forum: NFS@Home 2020-10-06, 09:40
Replies: 94
Views: 12,232
Posted By fivemack
L2004 progress

Tue Oct 6 05:33:39 2020 matrix is 28895048 x 28895460 (12137.1 MB) with weight 2859316727 (98.95/col)


ETA is 15 October
Forum: NFS@Home 2020-10-05, 11:36
Replies: 12
Views: 1,162
Posted By fivemack
Thanks for looking at that; my script was clearly...

Thanks for looking at that; my script was clearly misbehaving somewhere. Rerunning, I'm seeing 405321355 relations of which 405266903 are in the correct form, 312.9M unique, singleton removal...
Forum: NFS@Home 2020-10-04, 20:29
Replies: 23
Views: 1,321
Posted By fivemack
Would anyone be up for say 30k curves at B1=260M...

Would anyone be up for say 30k curves at B1=260M on F1565

...
Forum: NFS@Home 2020-10-04, 20:24
Replies: 12
Views: 1,162
Posted By fivemack
That's interesting; the status page...

That's interesting; the status page https://escatter11.fullerton.edu/nfs/crunching_fs.php says there are 390 million relations, I only see 311875466 relations of which about 249650000 unique and...
Forum: NFS@Home 2020-10-04, 10:11
Replies: 12
Views: 1,162
Posted By fivemack
I'm doing an initial filtering run on L1510 today.

I'm doing an initial filtering run on L1510 today.
Forum: NFS@Home 2020-10-01, 09:01
Replies: 94
Views: 12,232
Posted By fivemack
Starting L2004 post-processing today

Starting L2004 post-processing today
Forum: Factoring 2020-09-30, 16:03
Replies: 39
Views: 7,895
Posted By fivemack
The smallest 400-bit number with two 200-bit...

The smallest 400-bit number with two 200-bit prime factors is

0x98B1A3CA31877A7140FEFFA30608FBAB17232646BEC3BAA167 * 0xD699697AC5B27CD0A75D35F9E19320D82A4F4101B550C65E97 = 2^399+198081

(about...
Forum: Abstract Algebra & Algebraic Number Theory 2020-09-27, 08:10
Replies: 8
Views: 1,084
Posted By fivemack
An oddity of this form

It's absolutely obvious in retrospect, but, looking at the results of a match-up-large-primes run, if we have t^2+1=pq then (t+kq)^2+1 will also be divisible by q; and we may occasionally be lucky...
Forum: Msieve 2020-09-26, 22:53
Replies: 2
Views: 612
Posted By fivemack
I had a similar problem on ubuntu-20.04 (again,...

I had a similar problem on ubuntu-20.04 (again, this is the update which introduced gmp-6.2); I had to remove the lines


#if GMP_LIMB_BITS == 64
dest->_mp_d[0] = src;
...
Forum: Abstract Algebra & Algebraic Number Theory 2020-09-21, 09:52
Replies: 8
Views: 1,084
Posted By fivemack
I'm not convinced that reducing it to 3^#S...

I'm not convinced that reducing it to 3^#S continued-fraction calculations is all that much of a reduction, but I suppose it's at least conclusive; Arndt has a reasonable efficient sieving process.
...
Forum: Abstract Algebra & Algebraic Number Theory 2020-09-20, 20:09
Replies: 8
Views: 1,084
Posted By fivemack
largest n such that n^2+1 has prime factors within a set

To find Machin-like formulae for pi, I want to find sets of N where N^2+1 has only small prime factors. Tangentially, it would be nice to have a proof that, for example, n=485298 is the largest...
Forum: Factoring 2020-09-19, 21:21
Replies: 39
Views: 7,895
Posted By fivemack
Thank you! May I also point you at...

Thank you! May I also point you at https://mersenneforum.org/showthread.php?t=22626 ?
Forum: NFS@Home 2020-09-05, 09:18
Replies: 55
Views: 3,337
Posted By fivemack
Should I still be running my GNFS-20x Fibonacci...

Should I still be running my GNFS-20x Fibonacci numbers locally rather than trying to queue them up on _fs? I've upgraded the shed slightly (bargainhardware finally got cheap thoroughly-generic E5v3...
Forum: GPU Computing 2020-08-23, 23:19
Replies: 0
Views: 1,016
Posted By fivemack
ECM performance on GTX2000-series

Has anyone got benchmark figures for gmp-ecm-gpu running on GTX2000-series hardware? My GTX1080Ti seems to have completely given up the ghost.

(though obviously I should be waiting for...
Forum: chalsall 2020-07-18, 21:07
Replies: 35
Views: 2,477
Posted By fivemack
Is there a window manager anywhere which lets you...

Is there a window manager anywhere which lets you assign N workspaces to M monitors, rather than having N workspaces each the size of the whole monitor collection? Having code on one monitor and...
Forum: chalsall 2020-07-16, 08:47
Replies: 35
Views: 2,477
Posted By fivemack
I’ve used a Raspberry Pi 4 attached to a 55” UHD...

I’ve used a Raspberry Pi 4 attached to a 55” UHD screen quite successfully. Remember you’re sitting further back from a big TV; with it at the back of the small dining table I use as a desk, there’s...
Showing results 1 to 25 of 1000

 
All times are UTC. The time now is 14:45.

Thu Dec 3 14:45:06 UTC 2020 up 10:56, 0 users, load averages: 1.04, 1.23, 1.31

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.