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Forum: And now for something completely different 2021-11-26, 22:05
Replies: 71
Views: 8,383
Posted By Batalov
Our project was completely independent -...

Our project was completely independent - independent sieve and independent testing. We do not coordinate with that site. We cannot help you (or that site) document what you for some idle reason want...
Forum: And now for something completely different 2021-11-18, 21:51
Replies: 71
Views: 8,383
Posted By Batalov
Lightbulb Not all those who can read, can comprehend. Also,...

Not all those who can read, can comprehend. Also, not all those who can read, actually do read.

Hint: re-read the complete text of A004023 (https://oeis.org/A004023). What, upon reading, becomes...
Forum: And now for something completely different 2021-08-23, 22:48
Replies: 71
Views: 8,383
Posted By Batalov
You are welcome to test that. It appears to be...

You are welcome to test that. It appears to be trivial.

It is trivial to compute in Pari (because others already did the job of adapting the Kaprekar criterion; in Wikipedia it is described with a...
Forum: And now for something completely different 2021-05-27, 17:57
Replies: 71
Views: 8,383
Posted By Batalov
Chris might be on a vacation or something...

Chris might be on a vacation or something similar.
We haven't heard back (but we did send in the news and the updated graph).
Forum: And now for something completely different 2021-05-13, 01:11
Replies: 71
Views: 8,383
Posted By Batalov
awk '{print...

awk '{print "if(Mod(10,"$2")^"$1"!=1,print("$1"))"}' factors-from-4.3M.txt |gp -q
Cool beans. They are all good. I will attach here new factors, a bit later.
Forum: And now for something completely different 2021-05-12, 21:17
Replies: 71
Views: 8,383
Posted By Batalov
I will probably grep for all factors that are not...

I will probably grep for all factors that are not present in the site (even though to be safe we started from scratch), to keep the factor "delta" file size to minimum. (I also have a pari script to...
Forum: And now for something completely different 2021-05-12, 20:42
Replies: 71
Views: 8,383
Posted By Batalov
Plus I have just received a snapshot of current...

I have just received a snapshot of current results from Ryan (because we chatted about that request; usually I hear only about hits).
I also have lists of factors elsewhere; will post later. I also...
Forum: And now for something completely different 2021-05-12, 16:32
Replies: 71
Views: 8,383
Posted By Batalov
Arrow Discussion of definitions (once again supporting...

Discussion of definitions (once again supporting the earlier observation that "A thought, once spoken, is a lie") is moved to a separate thread (https://mersenneforum.org/showthread.php?t=26793).
Forum: And now for something completely different 2021-05-10, 15:43
Replies: 71
Views: 8,383
Posted By Batalov
Dear Andreas, yes, it is a language communication...

Dear Andreas, yes, it is a language communication issue.
Do you disagree with the phrase: "say anything, - and you will be misinterpreted by at least one"?
Or in other phrasing "A thought, once...
Forum: And now for something completely different 2021-05-10, 00:52
Replies: 71
Views: 8,383
Posted By Batalov
Lightbulb One thing that I didn't know, is that...

One thing that I didn't know, is that FBase=a=<some base> is honored by llr when set as Fermat base, that is no surprise.
But! -- what follows (i.e. L+F tests) is decoupled from the choice of a, so...
Forum: And now for something completely different 2021-05-09, 21:56
Replies: 71
Views: 8,383
Posted By Batalov
But who said that we didn't? Q: What happens...

But who said that we didn't?

Q: What happens if you simply run a test with llr?
A: it runs PRP, then Lucas and finally Frobenius tests. By default, no special CLI options are needed

By all...
Forum: And now for something completely different 2021-05-09, 19:34
Replies: 71
Views: 8,383
Posted By Batalov
There is a better form, and llr treats it...

There is a better form, and llr treats it optimally
ABC ($a*$b^$c$d)/$e
1 10 8177207 -1 9
LLR ver >= 3.8.24 will indeed create $temp.npg exactly like that, but even with earlier versions you can...
Forum: And now for something completely different 2021-05-09, 14:55
Replies: 71
Views: 8,383
Posted By Batalov
Plus It is R8177207

It is R8177207
Forum: And now for something completely different 2021-05-09, 04:52
Replies: 71
Views: 8,383
Posted By Batalov
We have the same scrutiny as GIMPS has....

We have the same scrutiny as GIMPS has. Especially given its size...
We are checking SPRP in 3-4 bases first (the best we can do for this PRP.)

(b | N) = -1 for b = {7, 11, 23, 41, ...}.
Forum: And now for something completely different 2021-05-08, 22:54
Replies: 71
Views: 8,383
Posted By Batalov
Thumbs up ... and.....................

Ryan keeps suspense, but now there is one more.
(apparently 5.7 million digits was not enough)

and pssst, ...it has several 7s again in the exponent :-)

Updated plot for Prof.Caldwell...
Forum: And now for something completely different 2021-04-27, 23:21
Replies: 71
Views: 8,383
Posted By Batalov
... and Frobenuis, too! Yes. Several...

... and Frobenuis, too!

Yes. Several trifectas obtained. (a = 3, 7, 11 and 17.)
Forum: And now for something completely different 2021-04-21, 16:18
Replies: 71
Views: 8,383
Posted By Batalov
Thumbs up True, but we might hit some other 9th root of...

True, but we might hit some other 9th root of unity. (we can then rule the false positive out, of course, with subsequent traditional tests; no false negatives should result).
Worth trying;...
Forum: And now for something completely different 2021-04-21, 15:33
Replies: 71
Views: 8,383
Posted By Batalov
I'll have to doublecheck in the source, but as...

I'll have to doublecheck in the source, but as far as I remember the code does the honest modular exponentiation of b^(N-1) using (in this case) mod (10^p-1) and then converts to giants and does a...
Forum: And now for something completely different 2021-04-21, 15:25
Replies: 71
Views: 8,383
Posted By Batalov
We finished 3-PRP, 7-PRP, 11-PRP, 13-PRP (and...

We finished 3-PRP, 7-PRP, 11-PRP, 13-PRP (and their SPRP chasers are still running, the Lucas+Frobenius test phases -- they are ~10x slower even on 32 threads).
Forum: And now for something completely different 2021-04-21, 05:35
Replies: 71
Views: 8,383
Posted By Batalov
It is almost the same, but operationally...

It is almost the same, but operationally speaking, running single jobs is cleaner with LLR2. (Prime95 stays running forever after worktodo.txt is spent/empty, and needs to be killed, or source...
Forum: And now for something completely different 2021-04-21, 01:12
Replies: 71
Views: 8,383
Posted By Batalov
Kurt's site ascertains that region below 4300447...

Kurt's site ascertains that region below 4300447 is finished.
We have not double-checked that region. We will check all eligible candidates in range 4,300,447 < p < 10,000,000 (or maybe less, --...
Forum: And now for something completely different 2021-04-20, 21:28
Replies: 71
Views: 8,383
Posted By Batalov
Plus New repunit (PRP) primes found, 5794777 and 8177207 decimal digits (PRP records)

The last two known repunits were found back in 2007. Welcome, the year 2021.

With Ryan Propper, we decided to give a boost to the project which changed a few homes...
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