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Search: Posts Made By: bdodson
Forum: Cunningham Tables 2016-10-26, 22:00
Replies: 295
Sticky: 2LM Table
Views: 39,791
Posted By bdodson
Sam has updated the "first five" on each of the...

Sam has updated the "first five" on each of the 18 tables; Oct 24. -bd
Forum: Cunningham Tables 2016-10-26, 15:04
Replies: 295
Sticky: 2LM Table
Views: 39,791
Posted By bdodson
OK, the c194 shows up on page 116 during 2010; ...

OK, the c194 shows up on page 116 during 2010; it's PaulZ's cofactor
of a c249, left by a p55.

Not that anyone has asked, but 2186L was a c282 before it was a
c227. Another PaulZ cofactor,...
Forum: Cunningham Tables 2016-10-24, 14:26
Replies: 295
Sticky: 2LM Table
Views: 39,791
Posted By bdodson
C194. Unless Tom ran some, this number likely...

C194. Unless Tom ran some, this number likely never
had a p60 test.


I can't even find a 4p55 on either one. Best I see are 2p55 and
3p55 tests on numbers from 2012. Not sure what Sam was...
Forum: Cunningham Tables 2016-09-28, 12:09
Replies: 295
Sticky: 2LM Table
Views: 39,791
Posted By bdodson
That's all five of the first five holes on the...

That's all five of the first five holes on the May 10th 2LM list. -Bruce
---
Forum: Cunningham Tables 2016-09-19, 13:09
Replies: 229
Sticky: 2+ table
Views: 35,797
Posted By bdodson
According to this description, no one would ever...

According to this description, no one would ever improve on their
best current effort; set as a limit. Any factor p70 or above is still
an achievement (fewer than 25, total, so far); but I...
Forum: Cunningham Tables 2016-09-05, 16:25
Replies: 78
Sticky: 11- table
Views: 19,141
Posted By bdodson
Uhm, that was 6366 11, 283- c268 ...

Uhm, that was

6366
11, 283- c268
2163935546312057591396633973695472429573850925562437339328089208815965709802705713361030484808230504878101465442961303
.p150 NFS@Home snfs
Looks like...
Forum: GMP-ECM 2016-08-31, 12:08
Replies: 469
Views: 67,392
Posted By bdodson
A snapshot of timings ...

A snapshot of timings

b402-12p274.ta-has01-linux-x86:Step 1 took 10795749ms [ATH]
b402-12p274.ta-has01-linux-x86:Step 2 took 4608298ms

b401-12p274.ta01-linux-x86:Step 1 took 13440512ms...
Forum: GMP-ECM 2016-08-23, 18:41
Replies: 469
Views: 67,392
Posted By bdodson
Thanks, I'll have a look. The new cluster has...

Thanks, I'll have a look. The new cluster has 128Gb/node, c. 6Gb/ core;
and it looks like I will be able to use all 20 cores. -Bruce
Forum: Cunningham Tables 2016-08-22, 17:41
Replies: 295
Sticky: 2LM Table
Views: 39,791
Posted By bdodson
p102*p123, yet another bad candidate for ecm. ...

p102*p123, yet another bad candidate for ecm. Does that
make p89 the smallest factor from these August factors?
Bruce
Forum: GMP-ECM 2016-08-22, 17:34
Replies: 469
Views: 67,392
Posted By bdodson
Super! I've already come back to expecting to...

Super! I've already come back to expecting to have to compile gmp and
the gmp-ecm locally to get better tuning, but still hoping not to have to
spend THIS afternoon on that. Production is going...
Forum: GMP-ECM 2016-08-20, 12:28
Replies: 469
Views: 67,392
Posted By bdodson
linux binary

Let's try this again. Is this the most recent gmp-ecm linux binary? I see
requests from Carlos on 2015-12-09 and again on 2016-03-08. But everything
since 7.0-dev is windows? -Bruce

(Thanks...
Forum: GMP-ECM 2016-08-19, 14:46
Replies: 469
Views: 67,392
Posted By bdodson
Is this the current haswell version? Must be...

Is this the current haswell version? Must be better
than benchmarking with the old athlon ... Nodes
are dual 10-core or dual 12-core.
Forum: Cunningham Tables 2016-04-29, 13:00
Replies: 229
Sticky: 2+ table
Views: 35,797
Posted By bdodson
Just finished .7t65 and t65 on 12,271+/-, after...

Just finished .7t65 and t65 on 12,271+/-, after initial 14t55 and 13t55.
Also some B1=3e9s on 271-. Hope these go well. -Bruce
Forum: Cunningham Tables 2016-04-27, 15:43
Replies: 229
Sticky: 2+ table
Views: 35,797
Posted By bdodson
Also 8 done of the 9 most wanted numbers...

Also 8 done of the 9 most wanted numbers reserved, just 2,1028+
left. Tasks for 2,1285- running here; 1028+ is the only other
Cunnningham reserved. Page 131 is about full (at last, since June),...
Forum: Cunningham Tables 2016-01-23, 22:16
Replies: 16
Views: 7,097
Posted By bdodson
I'm sure that I knew this, and read the thread,...

I'm sure that I knew this, and read the thread, when it was originally posted.
Here in 2016 the subject of the thread is inaccurate and distracting. Thanks
for the clarification.
-Bruce
Forum: Cunningham Tables 2016-01-21, 21:56
Replies: 16
Views: 7,097
Posted By bdodson
I'm not sure what about this factorization is the...

I'm not sure what about this factorization is the "3rd largest"; but p70
doesn't even make the top10 among ECM factors, which are measured
by the number of digits in the prime found by ECM. The...
Forum: Cunningham Tables 2016-01-02, 16:08
Replies: 229
Sticky: 2+ table
Views: 35,797
Posted By bdodson
I did fairly serious ecm attempts on 5-of-8 of...

I did fairly serious ecm attempts on 5-of-8 of these NFS@H reservations;
including a bunch of Sam's Wanted numbers and early holes. Actually,
everything except the base-2s, some of which already...
Forum: Cunningham Tables 2016-01-01, 15:28
Replies: 229
Sticky: 2+ table
Views: 35,797
Posted By bdodson
Yes; and I like the "massive msieve...

Yes; and I like the "massive msieve oversieving"; presumably with
a more tractable matrix? That's 31.77M^2 and quite a lot of cycle
removing.

Anyone other than nfs@H that's a possible...
Forum: Factoring 2015-06-05, 16:53
Replies: 24
Views: 2,103
Posted By bdodson
Strange, but I don't recall having learned this...

Strange, but I don't recall having learned this during my undergrad math studies. Also seems
to be somewhat beyond amateur analysis/stat. Of course, I do recall years of re-reading the ...
Forum: Factoring 2015-04-29, 22:17
Replies: 148
Views: 15,524
Posted By bdodson
To review, if I may; that was 900 t55's...

To review, if I may; that was 900 t55's distributed over
50 numbers from c200-c219 plus first fives under c280;

-vs-

120 t55's to raise the 3c60's to t67.5's on two numbers.

Seems like...
Forum: Factoring 2015-04-29, 16:40
Replies: 148
Views: 15,524
Posted By bdodson
I did 3t60s for the two current Cunningham gnfs...

I did 3t60s for the two current Cunningham gnfs records

which factored as

for the smallest factor. If I were doing the pretests now, I would have run the additional
2t60 = 10t55 on each, to...
Forum: Factoring 2015-04-28, 13:46
Replies: 148
Views: 15,524
Posted By bdodson
RE: regular Cunninghams from first five holes...

RE: regular Cunninghams from first five holes being sieved

Another less visible feature of the first five, 10,359- C208 was tested
to 24.4t55=c t65 before being selected by NFS@Home; and...
Forum: Factoring 2015-01-22, 15:17
Replies: 8
Views: 4,263
Posted By bdodson
The review on Math Reviews (with mathscinet...

The review on Math Reviews (with mathscinet license) is written by Carl. The relation
between p-1 and ECM is explained clearly in Koblitz's Course in Number Theory and
Crypto 1994. Hendrik's...
Forum: Twin Prime Search 2014-11-14, 11:51
Replies: 46
Views: 81,775
Posted By bdodson
Thanks. The formulation is different than we...

Thanks. The formulation is different than we heard here in his three lectures last Sept. I do recall
reading about conditional gaps being 12 or perhaps 6.(and nothing possible below 6, by current...
Forum: Twin Prime Search 2014-11-14, 01:18
Replies: 46
Views: 81,775
Posted By bdodson
Excuse me; but was anyone else listening to Tao...

Excuse me; but was anyone else listening to Tao on the Colbert Report yesterday? I'm fairly
sure that I heard him introduce "prime cousin" as a pair p and p+4', both prime and then
(maybe)...
Showing results 1 to 25 of 1000

 
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