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Search: Posts Made By: charybdis
Forum: NFS@Home 2022-08-07, 13:20
Replies: 90
Views: 5,511
Posted By charybdis
The number of relations needed is determined by...

The number of relations needed is determined by the lpb bounds, not by the size of the number. Increase each lpb by 1 and you ~double the number of relations required. The mfb bounds also have an...
Forum: NFS@Home 2022-08-06, 12:55
Replies: 463
Views: 58,891
Posted By charybdis
As discussed in this thread...

As discussed in this thread (https://www.mersenneforum.org/showthread.php?p=609753), these are both small jobs that can be run on a single PC within a week or two. If you care about them that much,...
Forum: NFS@Home 2022-08-05, 14:05
Replies: 94
Views: 5,966
Posted By charybdis
QUEUED AS 2_1443m1 2,1443- is a Cunningham...

QUEUED AS 2_1443m1

2,1443- is a Cunningham composite of SNFS difficulty 290 from the recent base 2 extension. Hopefully this will be the last one that I have to send to 15e.

n:...
Forum: And now for something completely different 2022-08-04, 12:08
Replies: 49
Views: 10,523
Posted By charybdis
The indices of the first 17 partition primes...

The indices of the first 17 partition primes (https://oeis.org/A046063) are 2, 3, 4, 5, 6, 13, 36, 77, 132, 157, 168, 186, 188, 212, 216, 302, 366...

I'm sure that if we were in the 1950s and this...
Forum: And now for something completely different 2022-08-04, 02:04
Replies: 49
Views: 10,523
Posted By charybdis
Then why did you ask whether it was finite or...

Then why did you ask whether it was finite or infinite?



What do you think is more likely?

1. There is some as-yet-undiscovered property of p(n) for n odd that makes it much, much less...
Forum: And now for something completely different 2022-08-04, 01:52
Replies: 49
Views: 10,523
Posted By charybdis
I'm not sure whether to laugh or cry... you...

I'm not sure whether to laugh or cry... you submit several new OEIS sequences, put "this sequence should be infinite" comments on all of them solely to make Sweety's life easier, and then this...
Forum: FactorDB 2022-08-03, 13:21
Replies: 71
Views: 18,823
Posted By charybdis
405 million primes, 265 million unfactored...

405 million primes, 265 million unfactored composites. http://factordb.com/status.php

The real point of xilman's post is that "for every new factor submitted, test it against hundreds of millions...
Forum: Science & Technology 2022-08-01, 20:25
Replies: 76
Views: 40,502
Posted By charybdis
Indeed! :smile: In order for it to make...

Indeed! :smile:

In order for it to make sense to talk about the centre of mass of a 3-sphere or a 3-torus, you need to embed it in 4-dimensional space. But hypothetically, if the universe has one...
Forum: Science & Technology 2022-08-01, 19:10
Replies: 76
Views: 40,502
Posted By charybdis
Finite =/= has a centre of mass. Where is...

Finite =/= has a centre of mass.

Where is the centre of mass of a uniform-density 3-sphere? Or a 3-torus?
Forum: NFS@Home 2022-08-01, 16:02
Replies: 100
Views: 6,251
Posted By charybdis
Depends how old your msieve is... Diff of...

Depends how old your msieve is...

Diff of /trunk/gnfs/filter/filter.c [r1022] .. [r1023] (dated 19 Aug 2018)

--- a/trunk/gnfs/filter/filter.c
+++ b/trunk/gnfs/filter/filter.c
@@ -156,7 +156,7...
Forum: Factoring 2022-08-01, 00:28
Replies: 91
Views: 6,557
Posted By charybdis
If you're going to invent terminology, please...

If you're going to invent terminology, please explain what it means, otherwise people will be mystified as you can see.



All I see there is posts that correctly point out that the square root...
Forum: NFS@Home 2022-07-30, 22:27
Replies: 100
Views: 6,251
Posted By charybdis
This particular octic polynomial is the poster...

This particular octic polynomial is the poster child for normalizing your yields (https://mersenneforum.org/showpost.php?p=568941&postcount=83) when test-sieving. The number of special-Q in a 5k...
Forum: Factoring 2022-07-30, 16:05
Replies: 91
Views: 6,557
Posted By charybdis
:no: What makes you believe that 2^1277-1...

:no:

What makes you believe that 2^1277-1 can't be written as a^2+3b^2? We won't know if it can be until we know at least one prime factor. N can be represented in the form a^2+3b^2 if and only if...
Forum: Msieve 2022-07-29, 15:13
Replies: 81
Views: 29,847
Posted By charybdis
The msieve-lacuda-nfsathome branch of...

The msieve-lacuda-nfsathome branch of https://github.com/gchilders/msieve_nfsathome.git.
As frmky said a few posts back, there is no precompiled Windows version. You should follow the instructions...
Forum: Msieve 2022-07-29, 02:00
Replies: 81
Views: 29,847
Posted By charybdis
None of the versions on mersenne.ca have the GPU...

None of the versions on mersenne.ca have the GPU linear algebra code.
Forum: Cunningham Tables 2022-07-27, 23:42
Replies: 19
Views: 16,677
Posted By charybdis
These three are borderline SNFS/GNFS. Most of...

These three are borderline SNFS/GNFS.
Most of the rest are probably beyond the degree 6/7 cutoff for SNFS? There will be a transitional zone where proximity of the exponent to multiples of 6 and 7...
Forum: Factoring 2022-07-26, 20:07
Replies: 64
Views: 8,441
Posted By charybdis
The number that the polynomial is "actually" for...

The number that the polynomial is "actually" for is the resultant of the rational and algebraic polynomials. For rational poly [$]g(x) = Y_1x-Y_0[/$] (note the minus sign, which makes the expression...
Forum: Msieve 2022-07-26, 17:44
Replies: 10
Views: 225
Posted By charybdis
I think Ed has already covered most of the...

I think Ed has already covered most of the relevant points, but this is not a good command line: you're telling msieve to use a 2x1 grid, so there should be 2 MPI processes, but you're running 12....
Forum: Cunningham Tables 2022-07-26, 17:37
Replies: 19
Views: 16,677
Posted By charybdis
2,2174L was done with 33-bit large primes,...

2,2174L was done with 33-bit large primes, 2,2174M started with 33-bit but was mostly done with 34-bit. This was the result:



So 2,1091+ should be possible with 34-bit large primes too. Though...
Forum: Cunningham Tables 2022-07-26, 00:29
Replies: 19
Views: 16,677
Posted By charybdis
Out of curiosity, I did some test-sieving for...

Out of curiosity, I did some test-sieving for 2,1091+ with the following parameters:
n:...
Forum: NFS@Home 2022-07-25, 11:53
Replies: 94
Views: 5,966
Posted By charybdis
Are you normalizing your yields...

Are you normalizing your yields (https://mersenneforum.org/showpost.php?p=568941&postcount=83)?



Theoretically it should be better to invert whenever skew is less than 1, but whether this...
Forum: NFS@Home 2022-07-25, 02:16
Replies: 94
Views: 5,966
Posted By charybdis
Re 1479823396757^19-1: with a skew that small...

Re 1479823396757^19-1: with a skew that small you're going to have b much larger than a in your relations and lose lots of them to "b > 2^32" when it comes to msieve filtering. As long as the ggnfs...
Forum: NFS@Home 2022-07-23, 18:46
Replies: 94
Views: 5,966
Posted By charybdis
QUEUED AS 2_2862M You were warned......

QUEUED AS 2_2862M



You were warned... :big grin:

2,2862M is a Cunningham composite of SNFS difficulty 287 from the recent base-2 extension. Under normal circumstances it would be done on...
Forum: XYYXF Project 2022-07-23, 01:19
Replies: 32
Views: 16,903
Posted By charybdis
Sorry :redface: To make up for this, I will be...

Sorry :redface:
To make up for this, I will be sending the next two hard jobs to 15e instead :devil:
Forum: XYYXF Project 2022-07-22, 16:29
Replies: 31
Views: 3,098
Posted By charybdis
There's a version on PrimeWiki:...

There's a version on PrimeWiki: https://www.rieselprime.de/ziki/SNFS_polynomial_selection

This doesn't cover XYYX polynomial selection. I don't know if there's anywhere that does. As I've said,...
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