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Forum: Aliquot Sequences 2021-06-23, 11:26
Replies: 3,504
Views: 339,788
Posted By fivemack
Drop 2327016

Drop 2327016
Forum: Aliquot Sequences 2021-06-23, 09:43
Replies: 3,504
Views: 339,788
Posted By fivemack
Take 1061748 1193460 2627844 2657424 2671548...

Take 1061748 1193460 2627844 2657424 2671548 2691360 2716542 2852412 2918496
Forum: Factoring 2021-06-21, 21:41
Replies: 378
Views: 11,032
Posted By fivemack
(1,10) done

Mon Jun 21 18:59:28 2021 p64 factor: 1338390497207220199271164911882588356198888527524342903132072077
Mon Jun 21 18:59:28 2021 p95 factor:...
Forum: Factoring 2021-06-20, 10:19
Replies: 378
Views: 11,032
Posted By fivemack
Nice work!

Nice work!
Forum: Factoring 2021-06-20, 10:14
Replies: 378
Views: 11,032
Posted By fivemack
(5,-8) C209 complete by SNFS Unspun...

(5,-8) C209 complete by SNFS

Unspun polynomial

n:...
Forum: Factoring 2021-06-16, 09:58
Replies: 378
Views: 11,032
Posted By fivemack
ETA Friday night for the 5,-8 SNFS job - getting...

ETA Friday night for the 5,-8 SNFS job - getting quite a lot of duplications, probably even this S210 I should have run with 15e.

May I take the C158/S195, I'll use the shiniest spun polynomial.
...
Forum: Factoring 2021-06-13, 09:42
Replies: 378
Views: 11,032
Posted By fivemack
This is the polynomial I used, which I found in a...

This is the polynomial I used, which I found in a few hours with a version of msieve CPU that I found under a rock (I think an x86_64 executable running on my ARM Mac)


n:...
Forum: Factoring 2021-06-12, 15:55
Replies: 378
Views: 11,032
Posted By fivemack
Nice split

C156 from line 55 splits as


p78 factor: 208030089699658289822530838465866133665512884513204464375029444713302449264703
p78 factor:...
Forum: Factoring 2021-06-11, 22:37
Replies: 378
Views: 11,032
Posted By fivemack
x^4 - 96*x^3 + 2232*x^2 - 17280*x + 32400 x^4 -...

x^4 - 96*x^3 + 2232*x^2 - 17280*x + 32400
x^4 - 24*x^3 + 288*x^2 - 4320*x + 32400
x^4 + 192*x^3 - 5544*x^2 + 34560*x + 32400


I can't help noticing that those polynomials have increasing powers...
Forum: Factoring 2021-06-11, 07:25
Replies: 378
Views: 11,032
Posted By fivemack
May I take the C209 S210 from (5,-8) on line 88?

May I take the C209 S210 from (5,-8) on line 88?
Forum: Factoring 2021-06-11, 07:20
Replies: 378
Views: 11,032
Posted By fivemack
Started 28*36 gmp-ecm curves at B1=3e8, default...

Started 28*36 gmp-ecm curves at B1=3e8, default B2 on the C253 from [8,-8].

That's going to be an extremely difficult SNFS job, my hope for finishing that corner is that ECM breaks off a piece big...
Forum: Factoring 2021-06-11, 07:04
Replies: 378
Views: 11,032
Posted By fivemack
Line 99 done (c139 split as p54 x p85 in 3h20m...

Line 99 done (c139 split as p54 x p85 in 3h20m wall-time on 28-thread Skylake)
Forum: Factoring 2021-06-10, 19:44
Replies: 378
Views: 11,032
Posted By fivemack
Having extracted a 22-digit prime factor by 30...

Having extracted a 22-digit prime factor by 30 thread-hours of SNFS from the c157 on line 99, I'm now running ECM on the other two integers. An even wiser person might have done it the other way...
Forum: Astronomy 2021-06-10, 19:30
Replies: 42
Views: 3,349
Posted By fivemack
1/4000 f/36 through cloud, after a short drive to...

1/4000 f/36 through cloud, after a short drive to get a bit south of Cambridge where the cloud cover was less complete:

https://www.chiark.greenend.org.uk/~twomack/eclipse.jpg
Forum: Factoring 2021-06-10, 17:06
Replies: 378
Views: 11,032
Posted By fivemack
OK, line 99 I'll start with the S160. I was...

OK, line 99 I'll start with the S160. I was briefly a Magma developer in a past life (I'm not sure whether my four-descent code is still in the current version, but I spent a lovely...
Forum: Factoring 2021-06-10, 09:17
Replies: 378
Views: 11,032
Posted By fivemack
Line 56 (6,-7) complete by SNFS. Required rather...

Line 56 (6,-7) complete by SNFS. Required rather more relations than I was expecting (29.7m raw worked, 29.3m raw didn't) and about 1100 thread-hours, so three or four days on a not-very-idle...
Forum: Factoring 2021-06-07, 20:54
Replies: 378
Views: 11,032
Posted By fivemack
For the C164 (SNFS 168.6) from (2,-8), I used ...

For the C164 (SNFS 168.6) from (2,-8), I used

rlim=alim=6000000
sieve Q=4.6M-7.0M
lpbr=lpba=27
mfbr=mfba=54
alambda=rlambda=2.6
gnfs-lasieve4I14e

It might be worth using 3LPR even at this...
Forum: Factoring 2021-06-07, 07:17
Replies: 378
Views: 11,032
Posted By fivemack
Found a P45 in the C227 from (7,-8) by ECM, which...

Found a P45 in the C227 from (7,-8) by ECM, which at least makes that line just about tractable by GNFS in the medium term.

Will now wait a moment until you are confident all the GCDs are killed...
Forum: Factoring 2021-06-05, 13:18
Replies: 378
Views: 11,032
Posted By fivemack
(5,-6) finished - the C139 has a P26 by ecm

(5,-6) finished - the C139 has a P26 by ecm
Forum: Factoring 2021-06-05, 10:24
Replies: 378
Views: 11,032
Posted By fivemack
Taking the cofactors from (7,-7); initially a day...

Taking the cofactors from (7,-7); initially a day of ECM on a dozen cores
Forum: Factoring 2021-06-05, 08:42
Replies: 378
Views: 11,032
Posted By fivemack
C156 from (6,-7) completed by ECM (p27, p39) ...

C156 from (6,-7) completed by ECM (p27, p39)

Taken a P25 out of the C152 and a P30 out of the C187

PS: also two P36 out of the C187, which is complete
Forum: Factoring 2021-06-05, 08:09
Replies: 378
Views: 11,032
Posted By fivemack
I'll take the two (5,-6) ones to start with; this...

I'll take the two (5,-6) ones to start with; this is a research direction I've been interested in since my PhD in early 2000s.

Could you also send me the SNFS polynomial for (3,-7) ?

I am also...
Forum: Hardware 2021-05-20, 11:42
Replies: 849
Views: 165,259
Posted By fivemack
Asus X99-A motherboard, second-hand E5-2673v4,...

Asus X99-A motherboard, second-hand E5-2673v4, running 20 threads at one per core


[Work thread May 20 12:44] Resuming primality test of M54082397 using FMA3 FFT length 2880K, Pass1=384,...
Forum: Homework Help 2021-05-20, 08:44
Replies: 39
Views: 4,231
Posted By fivemack
How on Earth did you notice that? I suppose...

How on Earth did you notice that? I suppose 'divisible by any number in OEIS' isn't a very large computation, but I wasn't aware that you could download the list of numbers in OEIS easily.
Forum: Information & Answers 2021-05-12, 18:17
Replies: 13
Views: 430
Posted By fivemack
Keeping Win10 laptop running flat-out

I have disabled 'turn off screen' and 'sleep' in the performance control panel, which seemed the only thing I could disable.

Nonetheless my laptop iteration times go up by about a factor two after...
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