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-   -   100M digits prefactor project. (https://www.mersenneforum.org/showthread.php?t=2558)

 Uncwilly 2004-05-29 22:00

100M digits prefactor project.

We have with GIMPS/PrimeNet officially working on the 10M digit issue and Luigi's Operation Billion Digit working toward 1,000M, there seemed to be a gap. Nobody has organized the work for the 100M digit prime.

So here is what I suggest.

We start working on the 100M digit range.

Using Luigi's Factor3_1 and Factor3_1b we can help clear the way for P-1 and L-L that shall follow.

I have done some preliminary work in factoring the range starting with M332192831 (the first prime expo. that will yield a 100M digit number). Starting here and working up to higher expos seems wise. If we can get a good projection of where the Mersenne prime might be, based upon the 1.47p rule, we can apply effort there, too.

I would like to suggest doing batch work. We can work in ranges and report results back etc.

More thoughts later. Anyone who wants to help speak up.

 Uncwilly 2004-05-30 05:53

M332192831 no factor from 2^54 to 2^62.

M332192897 no factor from 2^52 to 2^54.
M332192953 no factor from 2^52 to 2^54.
M332192957 no factor from 2^52 to 2^54.
M332192969 no factor from 2^52 to 2^54.
M332193019 no factor from 2^52 to 2^54.
M332193047 no factor from 2^52 to 2^54.
M332193053 no factor from 2^52 to 2^54.

There are a lot more, but if any one wants to run some of these up feel free, just post what you are taking.

I see the 100M digits prefactor project (100Mdpp) as having 2 aspects, the deep and the wide.
Deep is taking individual expos to high bit depths (what high is will be determined later). (Nose to the grindstone types work here).
Wide is taking a large range (e.g. 33200000 - 33300000) to a moderate bit depth (removing a huge amount of expos.). (short attention span folks that need to see lots happening work here).

 ET_ 2004-05-30 17:52

[QUOTE=Uncwilly]
More thoughts later. Anyone who wants to help speak up.[/QUOTE]

Don't forget to send all the factors found to Will Edgington! :smile:

Uncwilly, I don't remember if I ever posted an updated version of Factor3_1b on the forum... I will set it for download on the Billion Project page if you don't mind, so that it will reflect every further modification I will put on the source.

Luigi

 Uncwilly 2004-05-31 02:47

Cool, the link on you Billion digit page for Factor3_1 pointed to the attachment in the forum.....

As tto Will E. I plan to send a large batch that I have....

 lpmurray 2004-06-01 04:09

I started doing 332200007 - 332209991 to 50 bits i would have done a larger range but it is a pain putting ,1,50 on every line of the input file. I have a program that can give me the primes which i can cut and paste into a text file. is there anyway to automate the starting and ending bit depth. the run should be done soon. almost half have factors

 ET_ 2004-06-01 06:06

[QUOTE=lpmurray]I started doing 332200007 - 332209991 to 50 bits i would have done a larger range but it is a pain putting ,1,50 on every line of the input file. I have a program that can give me the primes which i can cut and paste into a text file. is there anyway to automate the starting and ending bit depth. the run should be done soon. almost half have factors[/QUOTE]

Try [URL=http://www.mersenneforum.org/attachment.php?attachmentid=145]this[/URL]. I wrote it some weeks ago for this purpose, I don't know if it the last version. Should you have problems, just drop me a pm and I'll set it up.

Luigi

 Uncwilly 2004-06-01 07:18

I have a program (in old fashioned basic) that will strip out the expos with factors (to a file that we can send to Will E.) and produce a new worktodo.ini with a set bit range.

I want to clear the expo that P95 is working on on this machine before I steal to much more time from it to prefactor.

 Uncwilly 2004-06-01 07:29

Is factor3_2b available?

 ET_ 2004-06-01 07:58

[QUOTE=Uncwilly]Is factor3_2b available?[/QUOTE]

Sure! Check [URL=http://www.gimps.it/billion/billion.htm]this[/URL] link! There are both factor3_2 and factor3_2b on the same Windows Zip archive.

Luigi

 Uncwilly 2004-06-01 13:11

I noticed that after I posted. I was asleep on my feet.

 Uncwilly 2004-06-02 01:44

332209991 - 332249999 out to 54 or 55 in three or four passes. 2014 expos

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