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Search: Posts Made By: kosta
Forum: FactorDB 2019-12-06, 09:26
Replies: 39
Views: 21,791
Posted By kosta
torrent?

So, what's with the idea of a factordb torrent? If it is only 1GB then it should not be too hard right? Seems like it would potentially open up all kind of useful and not so useful derivative...
Forum: FactorDB 2019-11-29, 12:08
Replies: 39
Views: 21,791
Posted By kosta
this must be a cleanup in response to "spam" and...

this must be a cleanup in response to "spam" and indiscriminate "search" that were discussed on this forum. Is there anywhere a backup of factordb? I myself have a saved page with the numbers that...
Forum: FactorDB 2019-11-29, 08:37
Replies: 39
Views: 21,791
Posted By kosta
Factordb wipeout?

As some of you know, I have been interested in fully factored numbers of the form (M61^k-1)/(M61-1). People on this forum plus yoyo invested quite some effort and helped to factor quite a few of...
Forum: FactorDB 2019-11-29, 08:24
Replies: 3
Views: 6,492
Posted By kosta
I've been submitting gmpecm7 findings anyway, by...

I've been submitting gmpecm7 findings anyway, by faking B1 and B2 values.
Forum: Software 2018-05-19, 16:35
Replies: 10
Views: 2,934
Posted By kosta
Or add a pipe like this ecm ...... | tee -a...

Or add a pipe like this
ecm ...... | tee -a foo.log
You will have both the file and on screen.
Forum: NFS@Home 2018-05-17, 07:01
Replies: 2,466
Views: 158,465
Posted By kosta
Sorry everyone, its fatigue, wrong number, wrong...

Sorry everyone, its fatigue, wrong number, wrong poly. The number is of course C176 (link to factordb) (http://factordb.com/index.php?id=1100000001130270247).

A much better one was found by Cado...
Forum: Msieve 2018-05-17, 06:51
Replies: 2,065
Views: 186,802
Posted By kosta
a

a
Forum: NFS@Home 2018-05-16, 13:49
Replies: 2,466
Views: 158,465
Posted By kosta
Much better poly was obtained with the higher...

Much better poly was obtained with the higher root optimization setting in cado, yield is twice as good:

n:...
Forum: NFS@Home 2018-05-16, 06:53
Replies: 2,466
Views: 158,465
Posted By kosta
The best poly so far, for the C174_M127_k24, at...

The best poly so far, for the C174_M127_k24, at 50% complete with CADO.
Is this good enough? Test sieving with some unoptimized param gave yield 8160 @6M, but i am not sure i did this right :-(

...
Forum: NFS@Home 2018-05-15, 14:35
Replies: 2,768
Views: 155,627
Posted By kosta
Alot. Its still running with yoyo at 850e6, so...

Alot. Its still running with yoyo at 850e6, so there is still some way to go...
For the c174, i will finish the polyselect myself, can i get help sieving?
Forum: NFS@Home 2018-05-14, 14:15
Replies: 2,768
Views: 155,627
Posted By kosta
I see someone has started the remaining c167 from...

I see someone has started the remaining c167 from the number ((2^31-1)^33-1)/(2^31-2) under c167_M31_k33 name, its nice to know. I have a couple more high-priority numbers:
one is c174 from M127_k24...
Forum: Information & Answers 2018-05-14, 01:09
Replies: 69
Views: 10,227
Posted By kosta
Octic is not supported in cado.

Octic is not supported in cado.
Forum: CADO-NFS 2018-05-13, 01:52
Replies: 522
Sticky: CADO NFS
Views: 97,583
Posted By kosta
Ran a c140 on cado, just to get familiar. The...

Ran a c140 on cado, just to get familiar. The number was an snfs, with a natural octic. Cado rejects octics, so i downconverted to a septic which looked decent enough, but has a yield which is way...
Forum: GMP-ECM 2018-05-12, 05:57
Replies: 8
Views: 4,631
Posted By kosta
How precise you want to be? Here is a decent...

How precise you want to be?
Here is a decent formula:

TIME [min] = 1min * (B1/10^7) * (Digits/100)^1.5 * ( 2Ghz / f )

Accuracy is at 5-10% level, you adjust the last factor to your hardware...
Forum: Cunningham Tables 2018-05-12, 05:22
Replies: 77
Views: 33,689
Posted By kosta
Anyone want to take that cofactor for NFS?

Anyone want to take that cofactor for NFS?
Forum: Cunningham Tables 2018-05-12, 03:58
Replies: 77
Views: 33,689
Posted By kosta
yoyo@home found a 67-digit factor of...

yoyo@home found a 67-digit factor of C243_M127_k24.
Many thanks!

Using B1=260000000, B2=3178559884516, polynomial Dickson(30), sigma=0:11839839710820506480
Step 2 took 328547ms
**********...
Forum: Cunningham Tables 2018-05-11, 07:24
Replies: 77
Views: 33,689
Posted By kosta
Mathematicians: 1 - Amateurs: 0 OK, i got...

Mathematicians: 1 - Amateurs: 0

OK, i got some private schooling from Silverman, that and a little bit more reading of their paper concentrated my mind.
I was in error, so sorry to everyone for...
Forum: Cunningham Tables 2018-05-10, 15:44
Replies: 77
Views: 33,689
Posted By kosta
That thread has a very fine post by Dubslow at...

That thread has a very fine post by Dubslow at #35, which is totally in agreement with what I'm trying to say here: the recommended curves at 5 digit steps are too much! But until now noone has been...
Forum: Cunningham Tables 2018-05-10, 08:00
Replies: 77
Views: 33,689
Posted By kosta
What we are missing here is what the economists...

What we are missing here is what the economists call a utility function. Someplace in that paper, Silverman and Wagstaff point out that running curves to 1-1/e probability of success is optimal in...
Forum: Cunningham Tables 2018-05-10, 05:53
Replies: 77
Views: 33,689
Posted By kosta
@VBCurtis If you are running 1/3 of the curves,...

@VBCurtis
If you are running 1/3 of the curves, at it seems you are actually doing, then it is nearly optimal. I have no problem with that.
Forum: Cunningham Tables 2018-05-10, 04:42
Replies: 77
Views: 33,689
Posted By kosta
nice paper

Nice paper by Silverman and Wagstaff, I'm reading it. The main contribution is to calculate B2 from given B1, it seems.


OK, so the exact factor is e, not 2. Close enough for me :smile: Sadly,...
Forum: Cunningham Tables 2018-05-09, 12:53
Replies: 77
Views: 33,689
Posted By kosta
@fivemack: The 3366 curves from that table will...

@fivemack:
The 3366 curves from that table will give you exp(-1) probability, so a few hundred curves will not give you "confidence" , you are right about that.

But there is something else. When...
Forum: Cunningham Tables 2018-05-08, 02:05
Replies: 77
Views: 33,689
Posted By kosta
p258550963755000298476185095462811 divides...

p258550963755000298476185095462811 divides M127_k71, but
sadly the cofactor is composite. I am going to try to continue, but not for now.
Request:
The following need more curves at 1e7, you can...
Forum: Hardware 2018-05-07, 06:00
Replies: 5
Views: 1,740
Posted By kosta
We have these in a mini-cluster. The 6-core-x2HT...

We have these in a mini-cluster. The 6-core-x2HT processor and the board are beasts, and still offer decent performance. However, the year is 2018, I would not throw away money on upgrades.
The...
Forum: Cunningham Tables 2018-05-04, 12:05
Replies: 77
Views: 33,689
Posted By kosta
@swellman M7 is of some interest, but this one...

@swellman
M7 is of some interest, but this one has been done to very high powers.
I am trying yet other strategies to obtain full factorizations for M127:
running ecm on k>100 hoping to get a...
Showing results 1 to 25 of 56

 
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