Reserved for MF - Sequence 4788 - Page 192

RichD · 2013-04-22, 21:02

I devoted several days on a GTX 460 card and got this poly. I think it is about average since Msieve states:

Code:

expecting poly E from 2.27e-13 to > 2.61e-13

Code:

# aq4788:5154
n: 17285154910805941577069464828335617544658066950627644021728302169526833018711670895092479561808160256160945139573800969912234390238908363042669550995167201537635764747005337
skew: 54453878.81
# skew 54453878.81, size 7.891e-17, alpha -8.253, combined = 2.438e-13 rroots = 5
Y0: -1984194768321507434058802020573021
Y1: 606427190915971723
c0: 17111183463229567250042987271571318169467520
c1: 5954767784533309908917895048435184628
c2: -48133715828031681374056493046
c3: -5548160975795079236918
c4: 18780066010531
c5: 562020

schickel · 2013-04-23, 08:26

Quote:

Originally Posted by RichD

I devoted several days on a GTX 460 card and got this poly. I think it is about average since Msieve states:

Code:

expecting poly E from 2.27e-13 to > 2.61e-13

So, have you come up with a plan on this? I could probably throw some cycles at it in a week or two, if you want to make it a team project. (I'm nearing the end of the sieving on a c168; maybe another week or so to go.)

RichD · 2013-04-23, 14:07

No plan. I know interest has waned recently. If people have a few cycles here or there that would be great. I'm not looking to coordinate (if it turns into) a sieving project.

schickel · 2013-04-26, 23:11

Quote:

Originally Posted by RichD

No plan. I know interest has waned recently. If people have a few cycles here or there that would be great. I'm not looking to coordinate (if it turns into) a sieving project.

Alright; if it turns out that there is any interest, I'll coördinate and do the post procressing.

VBCurtis · 2013-04-27, 06:26

Roughly how long a project is this? I think I'm willing to contribute a thread-month on an i7-windows64. Is that 5% of what's needed, or 1%?

I've never done a group sieve, but I have done a few OPN numbers up to 140 digits or so.

fivemack · 2013-04-27, 07:53

I'd say this was about a 2.5 CPU-year job (32-bit large primes, 15e, aim for 300 million relations). So one thread-month would be around 3-4%.

RichD · 2013-05-21, 02:20

I'll pledge 10, 12, 16M rels (initially). I just completed a 4 month SNFS project so a little burnt out on long winded runs.

schickel · 2013-05-21, 09:03

Quote:

Originally Posted by RichD

I devoted several days on a GTX 460 card and got this poly. I think it is about average since Msieve states:

Quote:

Originally Posted by VBCurtis

Roughly how long a project is this? I think I'm willing to contribute a thread-month on an i7-windows64. Is that 5% of what's needed, or 1%?

I've never done a group sieve, but I have done a few OPN numbers up to 140 digits or so.

Quote:

Originally Posted by fivemack

I'd say this was about a 2.5 CPU-year job (32-bit large primes, 15e, aim for 300 million relations). So one thread-month would be around 3-4%.

Are 32-bit primes required? The biggest team job I see on a quick search is this one that took ~1.5 months for a c172 with these parameters:

Code:

rlim: 40000000
alim: 40000000
lpbr: 30
lpba: 31
mfbr: 60
mfba: 90
rlambda: 2.6
alambda: 3.6

Quote:

Originally Posted by RichD

I'll pledge 10, 12, 16M rels (initially). I just completed a 4 month SNFS project so a little burnt out on long winded runs.

Unfortunately, this is probably going to be long winded....

RichD · 2013-05-22, 03:51

Quote:

Originally Posted by schickel

Unfortunately, this is probably going to be long winded....

That's what I meant when I didn't want to take ownership. I'll jump in and out with rels if others are also willing.

Any other pledgers?

Batalov · 2013-05-22, 04:03

It may be more productive to switch to some other large orphan sequence: 1560? 5250? 1992? or 7920? or other?

RichD · 2013-07-10, 02:05

Quote:

Originally Posted by Batalov

It may be more productive to switch to some other large orphan sequence: 1560? 5250? 1992? or 7920? or other?

I think there is enough interest, and outside resources, to pick up one or two of these sequences.

Does anyone know where they currently stand? Some ECM, more ECM, ready for GNFS?

I will try to get the ball rolling once a sequence and needs are defined.

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2013-04-23, 14:07	#2104
RichD Sep 2008 Kansas 3·1,129 Posts	No plan. I know interest has waned recently. If people have a few cycles here or there that would be great. I'm not looking to coordinate (if it turns into) a sieving project.

2013-04-27, 06:26	#2106
VBCurtis "Curtis" Feb 2005 Riverside, CA 2²·1,217 Posts	Roughly how long a project is this? I think I'm willing to contribute a thread-month on an i7-windows64. Is that 5% of what's needed, or 1%? I've never done a group sieve, but I have done a few OPN numbers up to 140 digits or so.

2013-04-27, 07:53	#2107
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 3×2,141 Posts	I'd say this was about a 2.5 CPU-year job (32-bit large primes, 15e, aim for 300 million relations). So one thread-month would be around 3-4%.

2013-05-21, 02:20	#2108
RichD Sep 2008 Kansas 3×1,129 Posts	I'll pledge 10, 12, 16M rels (initially). I just completed a 4 month SNFS project so a little burnt out on long winded runs.

2013-05-22, 04:03	#2111
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 22426₈ Posts	It may be more productive to switch to some other large orphan sequence: 1560? 5250? 1992? or 7920? or other?