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ThomRuley 2014-01-10 00:28

OPN Project Roll Call
 
Just checking to see if anybody is still working on the Odd Perfect Numer factoring. I haven't heard from William lately, and apparently neither have several others. I thought a good first step may be to find out who is still working on these factorizations.

RichD 2014-01-10 01:29

I still run a few ECM curves from the Composites Page and a NFS job ever once in a while.

I did notice [URL="http://mersenneforum.org/showpost.php?p=364015&postcount=162"]this post[/URL] from him a few days ago. I'm guessing he is pretty busy.

wombatman 2014-01-10 03:38

I just finished up a C159 recently (see the factor thread). Once I get my Christmas components put in this weekend (helloooooooo Ivy-bridge-E and DDR2133 :D), I may work on some more.

chris2be8 2014-01-10 16:34

I'm working on the SNFSable small composites in factordb. Which will include quite a few from OPN. Also the Brent tables which also include some OPN related numbers.

Chris

RichD 2019-04-07 19:04

I just noticed the website [url]http://oddperfect.org[/url] has gone away. The latest snapshot from the [url=https://web.archive.org/web/*/http://oddperfect.org]Way Back Machine[/url] is February 2 of this year. I haven't heard from William in a number of years.

ThomRuley 2019-04-07 19:11

I've been working on and off with Pascal Ochem. He was doing some work over here:

[url]http://www.lirmm.fr/~ochem/opn/[/url]

ThomRuley 2019-04-07 20:42

I haven't been able to help out the past few months (long story), but if you ask Pascal may have some composites lying around. I think he's still working on a proof that an OPN>10^2000

RichD 2019-04-07 21:48

I have grabbed a subset from the MWRB file which meets the conditions: weight > 600 & SNFS difficulty is roughly between 210-250. That list is nearing completion. I have also done all the numbers in t600 that would fit into the 14e (NFS@Home) queue as a 31-bit job or less. I would send the number first to yoyo@home then off to NFS@Home if applicable. I would also grab a few higher SNFS difficulty numbers which have a high weight, say > 20K. Many of the latter yoyo would find a factor and very few made it to the 15e queue.

On my personal hardware I run SNFS jobs from the txxxx files mostly of the form p^5-1 and p^7-1. I'm up to SNFS-184 I believe.

Brownfox 2019-04-08 08:51

I'm factoring composites from the MWRB file in SNFS difficulty order regardless of weight. There are no composites left with difficulty under 200 digits.

ThomRuley 2019-04-09 01:01

What's MWRB?

Uncwilly 2019-04-09 01:39

Most Wanted RoadBlocks.
[url]http://mersenneforum.org/showthread.php?p=275817[/url]

RichD 2019-04-09 01:57

[QUOTE=ThomRuley;513186]What's MWRB?[/QUOTE]

Sometimes these are not obvious to the casual observer. The link just below the Roadblocks header in the link you [url=http://www.lirmm.fr/~ochem/opn/]posted[/url] is the list of the MWRB "list of the most difficult composites" in the same format as the txxxx files.

wblipp 2019-04-10 11:55

[QUOTE=ThomRuley;364262]Just checking to see if anybody is still working on the Odd Perfect Numer factoring. I haven't heard from William lately, and apparently neither have several others. I thought a good first step may be to find out who is still working on these factorizations.[/QUOTE]
I'm still around, but haven't had the interest to update OPN for a few years. When the domain name came up for renewal I let it expire.

ThomRuley 2019-05-24 00:27

[QUOTE=wblipp;513328]I'm still around, but haven't had the interest to update OPN for a few years. When the domain name came up for renewal I let it expire.[/QUOTE]

How much would a domain name like that go for? I've been toying around with a sort of OPN library kind of site.

wblipp 2019-05-25 00:12

[QUOTE=ThomRuley;517593]How much would a domain name like that go for? I've been toying around with a sort of OPN library kind of site.[/QUOTE]

I just now looked, and the name does not expire until December; Perhaps I should renew it and share it with you - perhaps let you have lib.oddperfect.org or something like that. It would keep my options open for renewal of my enthusiasm. Let's switch to PM if you want to discuss further.


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