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Old 2009-01-23, 06:09   #1
wblipp
 
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Default Verser's Sixth

Rocke Verser continues to work the "soft side" of ElevenSmooth and has found another factor, this time a P37 from M(100800). This is the second known factor of this primitive, both found by ElevenSmooth. The composite cofactor has been reduced from C6925 to C6889. I've been slow to update the site; Rocke found this factor on Nov 15.

The "soft side" of ElevenSmooth has the factors of 21663200+1. Most of these primitives are not yet in the ECM Server. They received effort as part of the "Special Project" that used Prime95 on the entire 23326400-1. Rocke is the lastest of several searchers that have looked at this side in personal searches. Thanks, Rocke.
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Old 2009-01-28, 22:01   #2
VJS
 
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William,

I remember you use to have a page that listed each of the composites where one could download the numbmer and perform ... then report.

Is that page still availabe? I'm at the old e-mail address tlc4tvm.
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Old 2009-01-29, 00:58   #3
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The composites that are in the ecm server are also in this text file:

http://elevensmooth.com/composites.txt

I don't have a list for the "soft side" composites that are not in the ecm server. These were previously worked indirectly by using prime95 on the entire 23326400-1. As the B1 level rose, these curves were taking more time than people were willing to spend. We considered reducing the work time by working on some of the big factors. It's effectiveness was limited by the overlap of smaller primitives, and the coordination effort increased as lowM information was needed for each of the big factors. Between these drawbacks and the further work on many of the individual numbers, I don't think additional "prime95 in total" work is worth the trouble. I've been thinking about organizing the rest of the composites and adding them to the ecm server.
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Old 2009-01-29, 13:54   #4
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William,

Just by looking at the last 6 numbers 4 of them can be factored by ... 2

LOL seriously I think the file was cropped or something. I know people have offline machine such as myself. If a list were readily availabe for say ecm50+ work etc you might find a few more takers.
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Old 2009-01-29, 16:23   #5
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Quote:
Originally Posted by VJS View Post
Just by looking at the last 6 numbers 4 of them can be factored by ... 2
Looks fine here. Maybe your web browser is truncating lines? These last six numbers are from 4157 to 6936 digits long. I know I had to be careful about the tools I used to manipulate this file because some tools truncate or split long lines.

FYI the final digits are

2_30240P.C4157 21601
2_36960P.C4605 90241
2_33264P.C5159 29121
2_41580P.C5202 38401
2_47520P.C6909 67841
2_55440P.C6936 15201

You can tell where more effort is useful on the Progress page

If all goes well, the numbers larger than 3000 digits will become laggards because yoyo@home will work on the numbers below 3000 digits. These numbers all need more work at the 35 digit level (B1=1M). If tasks of this size are suitable, these would be my recommendations for off-net work. But any work on any number is appreciated.
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Old 2009-01-30, 04:29   #6
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William,

Your absolutely correct, I had to save the link to desktop, my browser was truncating.

Thanks

It's been a while does prime95 have a method for using P-1 or ECM on number inputs like ecm6 did?

n=####...###
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Old 2009-01-30, 04:58   #7
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Quote:
Originally Posted by VJS View Post
does prime95 have a method
Ohhh - you want to use prime95? Are you planning on running the whole elevensmooth exponent (3326400), or that divided by some small number? Five years ago we did a lot of prime95 ecm on the full exponent with B1 up to 50K. At the next level the curves took longer than people's patience.

If this is what you want to do, I know you will need the lowm file to filter out previously discovered factors. I'll need to refresh it a bit - perhaps a lot depending on the exponent you want to run. Prime95 has changed some since then, so we will also need somebody to help us get the setting right.

You won't need the information in the composites.txt file. I thought you were going to run ecm on one of the composite numbers.

Let me know what you want to do and I'll get the stuff together for you.

William
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Old 2009-01-30, 17:26   #8
mdettweiler
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Quote:
Originally Posted by wblipp View Post
Ohhh - you want to use prime95? Are you planning on running the whole elevensmooth exponent (3326400), or that divided by some small number? Five years ago we did a lot of prime95 ecm on the full exponent with B1 up to 50K. At the next level the curves took longer than people's patience.

If this is what you want to do, I know you will need the lowm file to filter out previously discovered factors. I'll need to refresh it a bit - perhaps a lot depending on the exponent you want to run. Prime95 has changed some since then, so we will also need somebody to help us get the setting right.

You won't need the information in the composites.txt file. I thought you were going to run ecm on one of the composite numbers.

Let me know what you want to do and I'll get the stuff together for you.

William
Recent versions of Prime95, if memory serves, have a feature that allows you to individually list previously-discovered factors on the number's worktodo.txt line, rather than needing a whole separate lowm.txt file. Full instructions should be in undoc.txt which comes with Prime95.
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Old 2009-01-31, 03:21   #9
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Quote:
Originally Posted by mdettweiler View Post
Recent versions of Prime95, if memory serves, have a feature that allows you to individually list previously-discovered factors on the number's worktodo.txt line, rather than needing a whole separate lowm.txt file.
I hope the lowm.txt is still supported. M(3326400) has a lot of algebraic factors, so lots of factors are already known.
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Old 2009-01-31, 14:59   #10
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Quote:
Originally Posted by wblipp View Post
I hope the lowm.txt is still supported. M(3326400) has a lot of algebraic factors, so lots of factors are already known.
it is i think
what p-1 has been run on P(3326400/2)
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Old 2009-01-31, 16:02   #11
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Quote:
Originally Posted by henryzz View Post
it is i think
what p-1 has been run on P(3326400/2)
Couldn't you have spent a few seconds working 3326400/2 out in your head? It isn't that hard!

3326400/2 = 1663200
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