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-   -   Polynomial Request Thread (https://www.mersenneforum.org/showthread.php?t=18368)

VBCurtis 2013-08-15 23:51

Skew is about 4 times the polys I'm finding. Nice score, it'll likely be the best we find.
Why do you start with A5=1?

firejuggler 2013-08-15 23:55

Because I do not find such gem with higher leading coef. I'll make another run at 40M to see if I find another one.

RichD 2013-08-16 01:25

[QUOTE=firejuggler;349673]got a big flare [/QUOTE]

Wow! After some test sieving it is yielding better than 4:1 throughout the range. If you guys want to stop, I am happy with it.

firejuggler 2013-08-16 01:37

please wait until someone else post a poly. The skew being 4 to 5 time smaller than mine in the higher range of leading coef, it might be better than mine.

RichD 2013-08-16 01:43

I just realized I used the wrong siever (15e). The proper one should be 14e.

I thought the sec/rel was high. Back to the drawing board.

Edit: I think I am confusing myself. The 14e siever is producing half the rels at only a 20% boost in performance. I'll check back in the morning...

firejuggler 2013-08-16 01:48

nevermind , wrong seq.

swellman 2013-08-17 01:18

Might I request one more poly? It's C169_141_71 from the xyyxf project.

[code]
1227197223602672829193383821970351855603123006836236259055513512132470494838659975966356335286773162785001346367567977767602727425980842702375345022271000585239446214933
[/code]

This factorization, along with the earlier C169 poly you guys were kind enough to run, should keep me occupied into the winter.

Thanks for any help.

debrouxl 2013-08-17 06:09

Aiming at setting new GNFS records for XYYXF, Sean ? :smile:

My GT540M is weak, others can help more efficiently...

wombatman 2013-08-17 06:57

Happy to hop on that C169 once I'm finished with the C155 (although it's looking like the 1st polynomial put up by firejuggler will be the best).

firejuggler 2013-08-17 09:07

I will start with a leading coef of 12M.....

swellman 2013-08-17 12:33

Thanks to all for running the poly. I really appreciate it. Hoping to dip my toe in the GPU pond next year.


[QUOTE=debrouxl;349907]Aiming at setting new GNFS records for XYYXF, Sean ? :smile:

My GT540M is weak, others can help more efficiently...[/QUOTE]

Nah, I'm just trying to eliminate all GNFS composites from the xyyxf project. C169 is about as large as I dare try solo.

It's fun to be on the record list, but I think it's more the result of Moore's Law than anything else. A C165 fell to GNFS on my i7 in a month. That was probably unimaginable 3-4 years ago. I can see in the not so distant future where a C175 GNFS is a fire-and-forget hobbyist-friendly effort on a home rig. How about GPU sieving. Is it theoretically possible?

If anyone wants to set the high water mark for xyyxf, there's [url=http://www.factordb.com/index.php?query=147%5E136%2B136%5E147]C197_147_136[/url]. It's the largest remaining GNFS. NFS@Home interested?:smile:


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