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View Poll Results: Need for a Fermat numbers factorization thread?
Yes, absolutely! 14 66.67%
Not much, thanks 4 19.05%
Too many factoring threads around... 2 9.52%
Who is Fermat? 1 4.76%
Voters: 21. You may not vote on this poll

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Old 2008-01-23, 23:44   #1
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"Luigi"
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Default Fermat numbers factorization

I feel the lack of a specialized thread dealing with Fermat numbers and their factorization. I often dig into the forum threads to find out information and ideas. So I'd like to test your interest in the subject, and eventually propose the opening of a new factoring thread...

Luigi
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Old 2008-01-23, 23:49   #2
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you know these:

http://www.prothsearch.net/fermat.html

http://www.fermatsearch.org/index.html (quite actual, see here: http://www.fermatsearch.org/news.html)

http://www.prothsearch.net/status.html

just another one: http://v5www.mersenne.org/report_ECM/

Last fiddled with by kar_bon on 2008-01-23 at 23:52
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Old 2008-01-23, 23:56   #3
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I do. I actually manage fermatsearch.org after Leonid Durman.'s leaving.
Neither Fermatsearch nor Prothsearch have a discussion forum, FermatNumbers mailing list seems like dead, and this is one of the reasons why I proposed the thread here

Mersenneforum has the best minds involved in number theory and number crunching, so to me it seemed a good place to start building a forum without spreading people over the net.

Luigi
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Old 2008-01-24, 01:36   #4
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FermatSearch had a Yahoo group for awhile. But nobody was interested and it died a silent death.

There's not many of us that do Fermat factoring. And of the ones that do, we tend to know what we're doing.
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Old 2008-01-24, 13:02   #5
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Quote:
Originally Posted by Jay View Post
FermatSearch had a Yahoo group for awhile. But nobody was interested and it died a silent death.

There's not many of us that do Fermat factoring. And of the ones that do, we tend to know what we're doing.
The FermatSearch website is alive once again. Hopefully it will stay around for a while.
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Old 2008-01-24, 14:23   #6
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@ET:

Three suggestions for the fermatsearch homepage:

The "STATS" link placed near the language links is not so good - it took my some time to find it - I didn't want to change the language and so I didn't take a second look to these links.

The stats page (http://www.fermatsearch.org/stats/stats.php) is missing a "Home" link.

The testing page (http://www.fermatsearch.org/testing.html) should have two buttons: One which is only calculating the required time, and a second one which actually generates the reservation mail.

P.S.: Reserving N=47 (what else with my nickname ) and k=5e13 to 8e13, I have also sent a mail.

Last fiddled with by Andi47 on 2008-01-24 at 14:36 Reason: Third suggestion
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Old 2008-01-24, 17:57   #7
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Quote:
Originally Posted by Andi47 View Post
@ET:

Three suggestions for the fermatsearch homepage:

The "STATS" link placed near the language links is not so good - it took my some time to find it - I didn't want to change the language and so I didn't take a second look to these links.

The stats page (http://www.fermatsearch.org/stats/stats.php) is missing a "Home" link.

The testing page (http://www.fermatsearch.org/testing.html) should have two buttons: One which is only calculating the required time, and a second one which actually generates the reservation mail.

P.S.: Reserving N=47 (what else with my nickname ) and k=5e13 to 8e13, I have also sent a mail.
Thank you Andy, your reservation has been placed.

I will update the site soon. You are right stats label is misplaced...

Luigi
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Old 2008-01-24, 18:02   #8
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Quote:
Originally Posted by Jay View Post
FermatSearch had a Yahoo group for awhile. But nobody was interested and it died a silent death.

There's not many of us that do Fermat factoring. And of the ones that do, we tend to know what we're doing.
You are right, Jay. I was just wondering about a forum to help newbies to appreciate Fermat factoring, giving them infos about the math that lies behind.

Mersenneforum gives road to many users, and some of them would be happy to offer their computational power on a "new" distributed project.

And it has been tiring (at least for me) to gather information about Fermat factoring in the forum, and had the idea to collect some of the most interesting messages in one place.

Luigi
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Old 2008-01-25, 01:39   #9
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I apologize if people think I'm lazy, but I was searching that site and couldn't find what I was looking for.

What is the lowest Fermat where no factors are known? Is it conclusively known to be composite, meaning a test has been run on it? (possibly doublechecked, would be nice to know that too).

Lastly, is there a web page that lists the status of low Fermat numbers, preferably without the clutter of the actual digits of factors? I'm interested in the numbers from F(5) to F(12), which is the lowest Fermat with more than 1,000 digits. (a nice "round" number for my silly human brain)
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Old 2008-01-25, 03:05   #10
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http://www.prothsearch.net/fermat.html

That should answer most of your questions.
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Old 2008-01-25, 07:51   #11
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Thanks, Jay, that definitely helps. :)
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