mersenneforum.org  

Go Back   mersenneforum.org > Search Forums

Showing results 1 to 25 of 391
Search took 0.05 seconds.
Search: Posts Made By: bur
Forum: And now for something completely different 2021-09-22, 19:06
Replies: 13
Views: 315
Posted By bur
The length has been corrected, now I can sleep...

The length has been corrected, now I can sleep peacefully.


Thanks for the explanations about the necessity of an odd number of digits. It's always fascinating how much can be deduced about...
Forum: Aliquot Sequences 2021-09-21, 17:27
Replies: 3,114
Views: 248,598
Posted By bur
Interesting, is it valid for most sizes of...

Interesting, is it valid for most sizes of numbers? That'd be quite helpful.
Forum: Aliquot Sequences 2021-09-20, 09:43
Replies: 3,114
Views: 248,598
Posted By bur
Good to know. Why is the duplicate...

Good to know.

Why is the duplicate percentage so low, is that after an inital removal already?
Forum: CADO-NFS 2021-09-20, 09:04
Replies: 63
Views: 12,097
Posted By bur
Thanks, that's very helpful. I also found that...

Thanks, that's very helpful. I also found that the commandline is saved to the sieving file.
Forum: CADO-NFS 2021-09-19, 16:08
Replies: 63
Views: 12,097
Posted By bur
I'm currently at mksol for the c167 (took 197M...

I'm currently at mksol for the c167 (took 197M relations). I started sieving at q = 17M. Since you mentioned earlier that a value of 17M was likely too large and the unique percentage is high (76%) I...
Forum: And now for something completely different 2021-09-17, 17:06
Replies: 13
Views: 315
Posted By bur
Palindrome prime number of digits is always odd (except 11, and this is true in any base)

This newly discovered largest known Palindrome prime was reported by Propper & Batalov:

10^1234567 - 20342924302 · 10^617278 - 1 (https://primes.utm.edu/primes/page.php?id=132715)

It's shown as...
Forum: Aliquot Sequences 2021-09-16, 15:56
Replies: 3,114
Views: 248,598
Posted By bur
You're right, even with a summary. I must have...

You're right, even with a summary. I must have been blind. Thanks again and sorry for the off-topic.
Forum: Aliquot Sequences 2021-09-16, 14:42
Replies: 3,114
Views: 248,598
Posted By bur
Thanks, to find the number of uniques I just did...

Thanks, to find the number of uniques I just did a wc -l on the lines not starting with #, does that yield the correct result? Is there a faster way, does remdup output the number somewhere?
Forum: Aliquot Sequences 2021-09-14, 16:56
Replies: 3,114
Views: 248,598
Posted By bur
How can the percentage of uniques be found during...

How can the percentage of uniques be found during sieving? By doing a manual filtering step on the relations?


Impressive progress anyway, about the same timeframe I need for a C167...
Forum: YAFU 2021-09-14, 12:31
Replies: 274
Views: 16,703
Posted By bur
Thanks!

Thanks!
Forum: YAFU 2021-09-13, 13:06
Replies: 274
Views: 16,703
Posted By bur
edit: I saw this was reported earlier and should...

edit: I saw this was reported earlier and should be fixed?

I pulled the newest version and did a make clean and make NFS=1 USE_SSE41=1 USE_AVX2=1 and building quits with the following error:


...
Forum: CADO-NFS 2021-09-08, 06:04
Replies: 63
Views: 12,097
Posted By bur
In an older post I saw why that initial c163...

In an older post I saw why that initial c163 sieved so fast:

skew 8385289.96, size 8.965e-16, alpha -7.745, combined = 1.077e-12 rroots = 5
The record is 1.096e-12.
Forum: CADO-NFS 2021-09-07, 12:06
Replies: 63
Views: 12,097
Posted By bur
Ok, good to know. Does it apply to sieving as...

Ok, good to know. Does it apply to sieving as well? I never observed non-utilized cores during sieving.


I started sieving a c167 from 1992:1644 on Sunday using a polynomial I searched previously...
Forum: Aliquot Sequences 2021-09-04, 04:57
Replies: 524
Views: 63,438
Posted By bur
Nothing interesting found: 10e6-11e6,...

Nothing interesting found:



10e6-11e6, incr=420, P=5M, nq=5^6
Best poly: 3.380e-15
Took 590000 thread-s
Forum: Aliquot Sequences 2021-09-03, 17:39
Replies: 524
Views: 63,438
Posted By bur
Thanks, that's very helpful again. So we are not...

Thanks, that's very helpful again. So we are not looking directly at the prime factors of a and b to create the squares but at the ideals?
Forum: Aliquot Sequences 2021-09-02, 18:18
Replies: 524
Views: 63,438
Posted By bur
Slightly off-topic, but I'll take the chance to...

Slightly off-topic, but I'll take the chance to ask: what are singletons and ideals?


In another thread you explained it as "...ideals are essentially the variables that our equations are in." Is...
Forum: Aliquot Sequences 2021-09-02, 17:54
Replies: 524
Views: 63,438
Posted By bur
Then I'll use P=5M as well, seems like a good...

Then I'll use P=5M as well, seems like a good middleground between 3M(c195) and 10M(c220). CADO documentation says a large P generally results in better polys, but fewer. Ambiguous as most parameters...
Forum: CADO-NFS 2021-09-02, 17:30
Replies: 63
Views: 12,097
Posted By bur
I didn't know that. For a 10 core should I use 5...

I didn't know that. For a 10 core should I use 5 clients à 4 threads or 10 à 2? And does sieving also benefit from hyperthreading? I didn't notice that problem during sieving.
Forum: Aliquot Sequences 2021-09-02, 12:58
Replies: 524
Views: 63,438
Posted By bur
I could also do a 1M range. Should the same...

I could also do a 1M range. Should the same parameters be used as for the c220 search just with an nq of 5^n?
Forum: CADO-NFS 2021-09-02, 07:59
Replies: 63
Views: 12,097
Posted By bur
I'll factor a c167 soon, did you change anything...

I'll factor a c167 soon, did you change anything in the params file in the meantime? Otherwise I'll use the one I used before but with wanted_rels = 190M. Which was the minimum that worked for the...
Forum: Linux 2021-09-02, 06:08
Replies: 19
Views: 4,167
Posted By bur
Ok, thanks, it worked. Are there any flags I...

Ok, thanks, it worked.

Are there any flags I could use to optimize e.g. for avx2? The makefile didn't look like it, but I'm far from being an expert there.
Forum: Aliquot Sequences 2021-09-01, 17:19
Replies: 3,114
Views: 248,598
Posted By bur
That sound like test-sieving is a career-option....

That sound like test-sieving is a career-option. Professional test-siever.



But seriously, thanks, I always enjoy these posts.
Forum: Factoring 2021-09-01, 12:44
Replies: 15
Views: 1,037
Posted By bur
That was unexpected, the c291 from line 110...

That was unexpected, the c291 from line 110 factored into p37*p42*p213 :)

Also both small factors were found with a low B1 of 1e6 and 3e6, respectively.
Forum: Linux 2021-09-01, 11:20
Replies: 19
Views: 4,167
Posted By bur
I tried compiling the sources from sourceforge,...

I tried compiling the sources from sourceforge, but get the following error:
g++: error: packages/gwnum/64bit/gwnum.a: File or directory not found
make: *** [makefile:8: pfgw64] Error 1
The...
Forum: Aliquot Sequences 2021-08-31, 20:56
Replies: 3,114
Views: 248,598
Posted By bur
Ok, then I won't get into it.

Ok, then I won't get into it.
Showing results 1 to 25 of 391

 
All times are UTC. The time now is 15:13.


Thu Sep 23 15:13:26 UTC 2021 up 62 days, 9:42, 0 users, load averages: 2.65, 3.27, 3.38

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.