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Forum: Miscellaneous Math 2020-10-22, 13:33
Replies: 6
Views: 210
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: 210
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: 8
Views: 604
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: 75
Views: 9,177
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: 14
Views: 672
Posted By fivemack
Thank you so much!

Thank you so much!
Forum: NFS@Home 2020-10-10, 10:16
Replies: 8
Views: 604
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: 14
Views: 672
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: 14
Views: 672
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: 75
Views: 9,177
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: 8
Views: 604
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: 14
Views: 672
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: 8
Views: 604
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: 8
Views: 604
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: 75
Views: 9,177
Posted By fivemack
Starting L2004 post-processing today

Starting L2004 post-processing today
Forum: Factoring 2020-09-30, 16:03
Replies: 34
Views: 5,880
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: 679
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: 305
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: 679
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: 679
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: 34
Views: 5,880
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: 2,115
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: 643
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: 1,555
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: 1,555
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...
Forum: chalsall 2020-07-15, 09:16
Replies: 35
Views: 1,555
Posted By fivemack
I think this is an issue with window managers...

I think this is an issue with window managers rather than with pixels, because it's fairly clear that people got quite a lot of software development work done in the days when you could tell a...
Showing results 1 to 25 of 1000

 
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