BOINC NFS sieving - NFS@Home - Page 105

BudgieJane · 2014-02-18, 10:21

Quote:

Originally Posted by swellman

GC_11_225 splits as

Code:

prp57 factor: 117035737516206000301422658636143086870641529583702222247
prp146 factor: 13224271120294906777055213566759272332532501009255338788377364771003595699735034613666924913891744508392976903138521770966663385051064509021025077

Aren't they the factors of GW_11_225?

pinhodecarlos · 2014-02-18, 11:31

Quote:

Originally Posted by BudgieJane

Aren't they the factors of GW_11_225?

From http://escatter11.fullerton.edu/nfs/crunching.php it is correct.

swellman · 2014-02-18, 11:46

Quote:

Originally Posted by BudgieJane

Aren't they the factors of GW_11_225?

No. What makes you think so?

RichD · 2014-02-18, 18:24

I'll take C160_3408_1385 next.

swellman · 2014-02-18, 20:26

Quote:

Originally Posted by swellman

I'll take GC_11_226.

Code:

prp67 factor: 1553921527600287191718979686051836235379378213250456395166935257817
prp99 factor: 641954075373038761835304204196178626395167333003090077344083180514397760392495700368829521814229341

BudgieJane · 2014-02-18, 21:26

Quote:

Originally Posted by swellman

No. What makes you think so?

Something strange happened in my application this morning. When I entered
GC_11_225 it returned me 225*11^225-1. I don't understand why. It's working correctly now. I'm sorry for not checking better before writing.

fivemack · 2014-02-18, 22:13

Code:

Tue Feb 18 21:44:08 2014  prp70 factor: 4514010676621572312243238194224226413610657161090911759766610581587907
Tue Feb 18 21:44:08 2014  prp108 factor: 696745277774474878010296222298269346995956048994202312288360817744618546275970282901710521370801719192054041

108 hours on i7/4930K -t6 for a 14.6M matrix

swellman · 2014-02-19, 00:35

Quote:

Originally Posted by BudgieJane

Something strange happened in my application this morning. When I entered
GC_11_225 it returned me 225*11^225-1. I don't understand why. It's working correctly now. I'm sorry for not checking better before writing.

No worries - double checking is always welcome. I was afraid that I'd missed something.

Come, join the post processing fun.

BudgieJane · 2014-02-19, 09:38

Quote:

Originally Posted by swellman

Come, join the post processing fun.

I would, but I'm too busy with generalised Cunninghams at the moment.

debrouxl · 2014-02-19, 17:54

Sean: I tried your yafu-generated poly for the XYYXF C176_118_93 number:

Code:

skew: 49.22
c0: 14210583768
c6: 1
Y0: -2342388736625917052139104541473924426001
Y1: 11973747886018297523742405394432

but it doesn't sieve much better than the polys generated by snfspoly: ~1 relation per q value at q0=45M (rlim /2 = alim / 2) using 31-bit LPs.

That number proves surprisingly hard for a SNFS difficulty 23x (depending on the polynomial) number. Even though 14e could probably do it with a lengthy sieving, 15e would probably be more efficient.

frmky · 2014-02-19, 20:00

Quote:

Originally Posted by debrouxl

Sean: I tried your yafu-generated poly for the XYYXF C176_118_93 number:

Try these:

Code:

skew: 0.417
c0: 8649
c6: 1643032
Y0: -2342388736625917052139104541473924426001
Y1: 1412902250550159107801603836542976

skew: 0.909
c0: 8649
c5: 13924
Y0: -175222860263437786894593195184969752945814431201
Y1: 2321443610525929019209484754762878943232

Not sure if either will be better...

2014-02-19, 17:54	#1154
debrouxl Sep 2009 977 Posts	Sean: I tried your yafu-generated poly for the XYYXF C176_118_93 number: Code: skew: 49.22 c0: 14210583768 c6: 1 Y0: -2342388736625917052139104541473924426001 Y1: 11973747886018297523742405394432 but it doesn't sieve much better than the polys generated by snfspoly: ~1 relation per q value at q0=45M (rlim /2 = alim / 2) using 31-bit LPs. That number proves surprisingly hard for a SNFS difficulty 23x (depending on the polynomial) number. Even though 14e could probably do it with a lengthy sieving, 15e would probably be more efficient.

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2014-02-18, 18:24	#1148
RichD Sep 2008 Kansas 2⁶×53 Posts	I'll take C160_3408_1385 next.