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Search: Posts Made By: charybdis
Forum: Factoring 2021-06-19, 23:44
Replies: 359
Views: 10,002
Posted By charybdis
Taking (6,-8) c179. Test-sieving suggested SNFS...

Taking (6,-8) c179. Test-sieving suggested SNFS is slightly faster than GNFS. There was very little to choose between Max's two spun polys so I went with the first one. I'm using I=15 and lpb 32/30.
Forum: Aliquot Sequences 2021-06-18, 21:56
Replies: 3,499
Views: 339,129
Posted By charybdis
Yes, I'm still working on it, but I won't be...

Yes, I'm still working on it, but I won't be updating factordb at least until it gets back to 150 digits with a driver.

Now that Clavier is no longer keeping track of this range I don't see any...
Forum: Factoring 2021-06-18, 21:33
Replies: 359
Views: 10,002
Posted By charybdis
Thank you! :smile:

Thank you! :smile:
Forum: Factoring 2021-06-18, 14:58
Replies: 359
Views: 10,002
Posted By charybdis
I think this is SNFS-258 so an SNFS poly would be...

I think this is SNFS-258 so an SNFS poly would be the last thing you want.
Forum: Factoring 2021-06-18, 12:40
Replies: 359
Views: 10,002
Posted By charybdis
Done, no factors. Max, please may I have...

Done, no factors.

Max, please may I have some spun polys for this number? I'm not reserving it right now, but I would like to test-sieve SNFS vs GNFS.
Forum: Aliquot Sequences 2021-06-18, 11:08
Replies: 3,499
Views: 339,129
Posted By charybdis
I thought that people would be more likely to...

I thought that people would be more likely to look for sequences without drivers and with small composites than for c160s to factor. And that might still be true, so I'm going to hold off for now. To...
Forum: Factoring 2021-06-17, 12:38
Replies: 359
Views: 10,002
Posted By charybdis
Running t50 on (6,-8) c179/snfs-229, will...

Running t50 on (6,-8) c179/snfs-229, will continue with t55 if no factors turn up.
Forum: CADO-NFS 2021-06-17, 12:11
Replies: 52
Views: 9,163
Posted By charybdis
I'd hold off on this c159 - given this...

I'd hold off on this c159 - given this (https://mersenneforum.org/showpost.php?p=581221&postcount=3490), I strongly suspect it's one that I've already factored. In which case I might as well provide...
Forum: Aliquot Sequences 2021-06-17, 11:13
Replies: 3,499
Views: 339,129
Posted By charybdis
Hmmm.... FYI the sequence...

Hmmm....







FYI the sequence is currently at line 2514. The numbers got smaller quite quickly, so I haven't updated it in factordb because I figured that would make it less likely someone...
Forum: Factoring 2021-06-16, 01:11
Replies: 359
Views: 10,002
Posted By charybdis
Quartic-239 is probably hard enough that it's...

Quartic-239 is probably hard enough that it's worth considering GNFS here. In any case this is a big job, and ECM to >t55 will be needed first.
Forum: Factoring 2021-06-15, 22:38
Replies: 359
Views: 10,002
Posted By charybdis
Yes. The relevant NFS@home jobs were run as 31/31...

Yes. The relevant NFS@home jobs were run as 31/31 but would likely have been faster as 32/30.
Forum: Factoring 2021-06-15, 22:25
Replies: 359
Views: 10,002
Posted By charybdis
NFS@home has run quartics of similar difficulty...

NFS@home has run quartics of similar difficulty as 31-bit jobs, so it might be worth bumping the lpbs up by 1 and increasing mfb/lim correspondingly.
Forum: Factoring 2021-06-14, 17:52
Replies: 359
Views: 10,002
Posted By charybdis
bur - watch that "excess" figure which pops up...

bur - watch that "excess" figure which pops up each time filtering runs; it was -1183116 in the log entry that you posted. That number should get smaller and smaller (in absolute value) until it...
Forum: Factoring 2021-06-14, 14:01
Replies: 359
Views: 10,002
Posted By charybdis
No, the figure of 17409881 just came from adding...

No, the figure of 17409881 just came from adding the deficit of 1183116 to the 16226765 existing unique relations. In other words, you need at least 1183116 more unique relations for filtering to...
Forum: Factoring 2021-06-12, 10:32
Replies: 359
Views: 10,002
Posted By charybdis
??? I don't see any claim that the L^2-norm is a...

??? I don't see any claim that the L^2-norm is a better predictor; in fact the authors even say on page 3 that the root-adjusted L^2-norm is only a rough estimate of polynomial performance and that...
Forum: CADO-NFS 2021-06-10, 12:33
Replies: 52
Views: 9,163
Posted By charybdis
The Murphy-E score reported by CADO is not the...

The Murphy-E score reported by CADO is not the same as that reported by msieve and cownoise.com. Technically the CADO one is closer to Murphy's definition of E, but it depends on the I value, qmin...
Forum: Factoring 2021-06-09, 18:55
Replies: 359
Views: 10,002
Posted By charybdis
In many standard cases of SNFS we have Y1 = 1 and...

In many standard cases of SNFS we have Y1 = 1 and Y0 negative. If your number N can be represented as a polynomial (usually deg 4-6) evaluated at an integer m - say, N = 4m^5 - 2m^2 + 37 - then that...
Forum: Factoring 2021-06-08, 23:21
Replies: 359
Views: 10,002
Posted By charybdis
(8,-8) c274 has the p45 factor...

(8,-8) c274 has the p45 factor 511481640851321883166633948095333636053000239, leaving a c229 - not much use unless there's another ECM hit.
t45 is complete on this number, as well as (8,-6) c143,...
Forum: Factoring 2021-06-08, 21:17
Replies: 359
Views: 10,002
Posted By charybdis
(8,-8) c239 split by ECM as...

(8,-8) c239 split by ECM as 310348486740573473695699530645210596527319521 (p45) * 13138714022339701164878297784507475113411104419 (p47) * p148
Forum: Factoring 2021-06-07, 21:51
Replies: 359
Views: 10,002
Posted By charybdis
I'd highly recommend skewing your parameters....

I'd highly recommend skewing your parameters. Even something as extreme as lpbr=30, lpba=28, mfbr=60, mfba=56, and doubling rlim and halving alim finds relations ~35% faster in a quick CADO test, and...
Forum: Factoring 2021-06-07, 15:08
Replies: 359
Views: 10,002
Posted By charybdis
ncurves is of minor importance; you can leave it...

ncurves is of minor importance; you can leave it out and CADO will pick its own values. The only concern is that you can lose relations if you set it too low. I think Curtis has done more...
Forum: Factoring 2021-06-07, 14:26
Replies: 359
Views: 10,002
Posted By charybdis
Re SNFS parameters/difficulty: these numbers have...

Re SNFS parameters/difficulty: these numbers have quartic polynomials, well above the range where quartics are optimal. As a result, they will be a bit more difficult than the standard SNFS/GNFS...
Forum: Factoring 2021-06-03, 13:34
Replies: 36
Views: 1,472
Posted By charybdis
Don't think the static Q is the issue here, it's...

Don't think the static Q is the issue here, it's more that you're taking a and b at the edge of the sieving rectangle. The relations are concentrated towards the middle, where a and b, and therefore...
Forum: Factoring 2021-06-03, 11:06
Replies: 36
Views: 1,472
Posted By charybdis
On this number, YAFU test-sieves three...

On this number, YAFU test-sieves three polynomials. For each one, it decides which side it thinks is fastest and tests only that side. I'm suggesting that it should also test algebraic vs rational...
Forum: Factoring 2021-06-02, 23:04
Replies: 36
Views: 1,472
Posted By charybdis
I don't know how you got such a huge difference...

I don't know how you got such a huge difference in the ETAs; CADO can spit out some suspect values early on in the job, and I bet that if you let these jobs run to completion the running times would...
Showing results 1 to 25 of 313

 
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