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Search: Posts Made By: charybdis
Forum: Factoring 2022-08-13, 22:50
Replies: 27
Views: 1,060
Posted By charybdis
Using shortcuts in the path is fine. CADO creates...

Using shortcuts in the path is fine. CADO creates a directory in /tmp by default, but you can put the path anywhere you want, preferably not in /tmp.

Why do you care about the length of the...
Forum: Factoring 2022-08-13, 17:03
Replies: 27
Views: 1,060
Posted By charybdis
Workdir sets the directory where CADO will put...

Workdir sets the directory where CADO will put all the files related to its current job. You should make a new one for each job and give it a helpful name, e.g. if you were factoring the 139-digit...
Forum: Aliquot Sequences 2022-08-13, 14:34
Replies: 162
Views: 53,905
Posted By charybdis
Sweety is unsurprisingly banned from OEIS. You...

Sweety is unsurprisingly banned from OEIS. You reap what you sow.
Forum: Factoring 2022-08-13, 13:19
Replies: 27
Views: 1,060
Posted By charybdis
Looks like polynomial selection and sieving went...

Looks like polynomial selection and sieving went smoothly, but there was a crash in linear algebra. I've never seen this particular crash before. If they haven't been wiped yet, could you post the...
Forum: Dobri 2022-08-13, 11:10
Replies: 51
Views: 4,649
Posted By charybdis
These have the simplest explanation of all. If p...

These have the simplest explanation of all. If p and k are both 2 mod 3 then 2kp+1 is divisible by 3 and so can't be prime.
Forum: NFS@Home 2022-08-09, 17:24
Replies: 103
Views: 5,942
Posted By charybdis
This does make sense for numbers where the...

This does make sense for numbers where the algebraic and rational norms are very similar in size. The special-q essentially gives you a large prime for free on the side that you're sieving on, so...
Forum: Dobri 2022-08-08, 11:42
Replies: 51
Views: 4,649
Posted By charybdis
This is equivalent to saying that if 8p+1 is...

This is equivalent to saying that if 8p+1 is prime and of the form (2a-1)^2+64(2b-1)^2, then 2 is an 8th power mod 8p+1.

You've rediscovered an old result on when 2 is an 8th power modulo a prime....
Forum: NFS@Home 2022-08-08, 11:19
Replies: 103
Views: 5,942
Posted By charybdis
2^lpb is the cutoff for the size of the largest...

2^lpb is the cutoff for the size of the largest primes/ideals that can appear in relations. Increasing lpb means that you find more relations, because you're allowing larger primes. But you also need...
Forum: Aliquot Sequences 2022-08-08, 11:13
Replies: 162
Views: 53,905
Posted By charybdis
You're right about more equations than unknowns,...

You're right about more equations than unknowns, but the equations correspond to ideals, not relations. The equations encode "this ideal must appear an even number of times in the desired set of...
Forum: Msieve 2022-08-07, 18:16
Replies: 94
Views: 527
Posted By charybdis
You've already been talking to the author. He is...

You've already been talking to the author. He is "frmky". (Edit for clarification: he's only the author of that github repo with the GPU linear algebra and multithreaded square root. The main author...
Forum: NFS@Home 2022-08-07, 13:20
Replies: 103
Views: 5,942
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: 465
Views: 59,073
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: 97
Views: 6,264
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: 10,657
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: 10,657
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: 10,657
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: 18,990
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: 40,757
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: 40,757
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: 106
Views: 6,676
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: 6,754
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: 106
Views: 6,676
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: 6,754
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: 94
Views: 527
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: 94
Views: 527
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.
Showing results 1 to 25 of 802

 
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