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Search took 0.05 seconds. Search: Posts Made By: bchaffin
Forum: Information & Answers 2021-01-26, 23:56
Replies: 0
Views: 862
Posted By bchaffin
Periodic mprime benchmarking

I'm running PRP testing with several workers each using several cores, using the latest mprime (v30.3 build 6). About once a day, mprime automatically does benchmarking to choose the best FFT...
Forum: Software 2020-07-16, 04:29
Replies: 484
Views: 83,528
Posted By bchaffin
Foolishly I posted this shortly before going off...

Foolishly I posted this shortly before going off grid for three days. The initial verbose output from pfgw:


command: pfgw64 -N -V -r '-q(10^4568899-1)/9'

PFGW Version...
Forum: Software 2020-07-15, 20:47
Replies: 484
Views: 83,528
Posted By bchaffin
Another repunit which fails with special modular reduction

I found another repunit which fails repeatedly when run with special modular reduction. This is using pfgw4.0.1, which uses square_carefully for the last 50 iterations. (See post...
Forum: Software 2019-12-04, 17:34
Replies: 484
Views: 83,528
Posted By bchaffin
I can also confirm that the package on...

I can also confirm that the package on SourceForge works correctly, although the pfgw64 binary was not executable when I first unzipped it.

Thanks rogue for the quick fix, and a great tool.
Forum: Software 2019-12-04, 00:23
Replies: 484
Views: 83,528
Posted By bchaffin
Sorry, I had missed a whole page of the recent...

Sorry, I had missed a whole page of the recent discussion when I posted that last reply. Building PFGW myself was a bit of an adventure, but I got it working in the end. With 4.0.1, I see the same...
Forum: Software 2019-12-03, 22:59
Replies: 484
Views: 83,528
Posted By bchaffin
If it helps, a few more cases which show the same...

If it helps, a few more cases which show the same problem:
R(255133)
R(338669)
R(435751)

(And yes, I know of the repunit primes project, thanks -- I'm just messing around. :smile:)
Forum: Software 2019-12-02, 23:04
Replies: 484
Views: 83,528
Posted By bchaffin
Sure, see below. I'm running Ubuntu 18.04 on an...

Sure, see below. I'm running Ubuntu 18.04 on an i9-9980XE, which is a Skylake core. The pfgw64 binary is from Sourceforge, I didn't build it myself.

Here's the special reduction output (this was...
Forum: Software 2019-12-02, 19:48
Replies: 484
Views: 83,528
Posted By bchaffin
Odd results testing repunits with pfgw 4.0.0

I couldn't find a thread on the release of PFGW v4.0.0, so posting this here -- please redirect me if there is a more recent discussion.

I noticed that testing R(n) uses the generic modular...
Forum: Aliquot Sequences 2013-11-29, 20:41
Replies: 3,446
Views: 319,856
Posted By bchaffin
Releasing 429960 and 572514. (Henryzz kindly...

Releasing 429960 and 572514. (Henryzz kindly reminded me that I left some orphaned reservations around.)
Forum: Aliquot Sequences 2012-03-05, 20:52
Replies: 982
Views: 100,647
Posted By bchaffin
91008 terminates at term 2845, from a max height...

91008 terminates at term 2845, from a max height of 112 digits. (Or merges with 71264, depending on how you want to count it.)

I think that's my first termination under 100k. Woot!
Forum: Aliquot Sequences 2012-02-27, 17:25
Replies: 823
Views: 45,471
Posted By bchaffin
The elves have finished all the c109s on open...

The elves have finished all the c109s on open unreserved sequences under 1M.

(With the exception of a number of sequences which are currently broken in the DB, of course.)
Forum: FactorDB 2012-02-17, 17:12
Replies: 1,616
Views: 146,832
Posted By bchaffin
878560 is another broken Aliquot sequence -- it...

878560 is another broken Aliquot sequence -- it thinks 531754410288614879 is prime.

Also 363270.
Forum: FactorDB 2012-02-13, 20:11
Replies: 1,616
Views: 146,832
Posted By bchaffin
The aliquot sequence for 174888 seems to be...

The aliquot sequence for 174888 seems to be broken... it appears that sigma was computed incorrectly at term 143.
Forum: Aliquot Sequences 2012-02-13, 19:45
Replies: 982
Views: 100,647
Posted By bchaffin
Yes, exactly. I do work on all 9000+ open...

Yes, exactly. I do work on all 9000+ open sequences, but not all at once -- these days I have about 24 threads running at lowest priority on hyper-threaded machines shared with other tasks. That's...
Forum: Aliquot Sequences 2012-02-12, 17:55
Replies: 982
Views: 100,647
Posted By bchaffin
Speaking of successes, 712068 terminates at term...

Speaking of successes, 712068 terminates at term 3235, from a max height of 114 digits.
Forum: Aliquot Sequences 2012-02-10, 17:53
Replies: 272
Views: 22,078
Posted By bchaffin
Actually not this time. 812240 was at c110, 2^2*3...

Actually not this time. 812240 was at c110, 2^2*3 for ages (above the workers' current threshold of c109), then jumped forward 11 terms and had 2^3*3*5. So someone took it for a spin separately.
...
Forum: Aliquot Sequences 2012-02-03, 18:08
Replies: 1,167
Views: 28,398
Posted By bchaffin
Does anyone have any evidence that 985596 was...

Does anyone have any evidence that 985596 was ever at 110 digits (or terminated/merged)?

It doesn't show up in a search of the forum, so it was never included in any 100-digit or 110-digit...
Forum: Aliquot Sequences 2012-01-30, 19:22
Replies: 823
Views: 45,471
Posted By bchaffin
The Aliquot workers reached a milestone over the...

The Aliquot workers reached a milestone over the weekend: half a million factorizations. When they started in early March 2010, the 'floor' of composites in open sequences was at 96 digits. Now it's...
Forum: FactorDB 2012-01-30, 17:15
Replies: 34
Views: 5,114
Posted By bchaffin
Trial division sort of works... I now sometimes...

Trial division sort of works... I now sometimes see only some small factors, like I see 2*c110 even though the c110 is divisible by 3. Other times it seems to work normally.

My aliquot workers...
Forum: FactorDB 2012-01-28, 06:43
Replies: 34
Views: 5,114
Posted By bchaffin
It seems that the DB is no longer doing trial...

It seems that the DB is no longer doing trial factoring on new composites -- at least, when I query an Aliquot sequence, the last term is now typically a single composite, even though it may have a...
Forum: Aliquot Sequences 2012-01-13, 18:00
Replies: 982
Views: 100,647
Posted By bchaffin
Yes, in true capitalist style I don't do anything...

Yes, in true capitalist style I don't do anything myself, my workers do it all for me. :smile: I've had much more success in terminations by following the workers' simple rules than by trying to pick...
Forum: Aliquot Sequences 2012-01-12, 18:43
Replies: 982
Views: 100,647
Posted By bchaffin
Yep, I just found 241506 last night: ...

Yep, I just found 241506 last night:
241506.2822 merges with 4800.7

I noticed 816792 a couple weeks ago also (it should actually be credited to 2011). I didn't say anything at the time and then...
Forum: Aliquot Sequences 2012-01-09, 17:40
Replies: 982
Views: 100,647
Posted By bchaffin
Here's one to start off the new year: 224560...

Here's one to start off the new year:

224560 terminates in 3185 terms, after a bumpy ride down from 113 digits.
Forum: Aliquot Sequences 2012-01-01, 07:28
Replies: 823
Views: 45,471
Posted By bchaffin
And, just in time for the new year (in my time...

And, just in time for the new year (in my time zone, anyway)... the elves have finished all the c108s in open unreserved sequences!

Happy new year, everyone!
Forum: Aliquot Sequences 2011-12-26, 19:31
Replies: 982
Views: 100,647
Posted By bchaffin
Well, since you asked so nicely... :smile: ...

Well, since you asked so nicely... :smile:

644664.3882 merges with 37632.2. One more down in 2011!
Showing results 1 to 25 of 372
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