Reserved for MF - Sequence 4788 - Page 76

frmky · 2010-02-19, 02:58

Code:

prp51 factor: 388506058643583355437271607661833307213566452269017
prp77 factor: 32036182249699730203082985730853613751522637113555017710745413833553416908691

jrk · 2010-02-19, 03:55

Now a c171

Code:

193180597261434437130723427223452983749001196443861486431050101233095959046579376056784397572419692971642911818089261513816572456073452501892312801518858596361529181158803

Andi47 · 2010-02-19, 05:57

Quote:

Originally Posted by jrk

Now a c171

Code:

193180597261434437130723427223452983749001196443861486431050101233095959046579376056784397572419692971642911818089261513816572456073452501892312801518858596361529181158803

This will need *lots* of ECM. My guess is somewhat more than t55, i.e. ~17700 @ 110e6 and a couple of curves at 260e6?

Raman · 2010-02-19, 07:18

If this 171 digit number had been prime, the aliquot sequence would have acquired
the downdriver now, right?

@frmky (Greg): How many systems did you make use of
in order to find out that p53 factor by using ECM,
crack that c106 within half an hour
crack that c128 within 5 hours of time

Only 13 more iterations count for sequence 314718 to reach (hit) 9000 iterations is being left over!
that is remaining actually...

frmky · 2010-02-19, 07:40

Quote:

Originally Posted by Raman

@frmky (Greg): How many systems did you make use of
in order to find out that p53 factor by using ECM,
crack that c106 within half an hour
crack that c128 within 5 hours of time

Eight 2.4GHz Core 2 Quads, totaling 32 cores.

10metreh · 2010-02-19, 07:55

Quote:

Originally Posted by Raman

If this 171 digit number had been prime, the aliquot sequence would have acquired
the downdriver now, right?

No, the prime would have to be of the form 4n+1. This c171 is of the form 4n+3.

Assuming the c171 splits into two factors, there is a 1/2 chance that it will split into primes of the form 8n+1 and 8n+3, losing the 2^3, and a 1/2 chance that it will split into primes of the form 8n+5 and 8n+7, keeping the 2^3. The good news is that it can't pick up a 3, but that wouldn't really matter if it got 2^4 * 31...

Andi47 · 2010-02-19, 08:01

Quote:

Originally Posted by frmky

Eight 2.4GHz Core 2 Quads, totaling 32 cores.

I guess you also distributed the poly search between these cores? Do you use a script for doing this?

Edit:

Quote:

Originally Posted by 10metreh

No, the prime would have to be of the form 4n+1. This c171 is of the form 4n+3.

Assuming the c171 splits into two factors, there is a 1/2 chance that it will split into primes of the form 8n+1 and 8n+3, losing the 2^3, and a 1/2 chance that it will split into primes of the form 8n+5 and 8n+7, keeping the 2^3. The good news is that it can't pick up a 3, but that wouldn't really matter if it got 2^4 * 31...

Don't jinx it! *knocking on wood*

btw: is there any chance to get the downdriver if the 2³ is lost?

frmky · 2010-02-19, 08:18

Quote:

Originally Posted by Andi47

I guess you also distributed the poly search between these cores? Do you use a script for doing this?

In this case, no. But the ggnfs distribution includes scripts (search_a5) to distribute the poly search if you use pol5. To distribute msieve polsel, I just run in different directories and concatanate the .p files.

Joshua2 · 2010-02-19, 08:24

i would think cpu time is better spent doing like ecm since gpus are faster at poly's I will do p-1 if no one else is.

Andi47 · 2010-02-19, 08:38

Quote:

Originally Posted by Joshua2

I will do p-1 if no one else is.

To which bounds?

can you please save stage 1 (at the best done with the -chkpnt filename option) and post it, just in case if we want to increase the bounds later, that we don't need to re-do stage 1?

Edit2: 59@11e6, no factor

fivemack · 2010-02-19, 11:04

I'm running 2000@11e7 over the weekend. (raman: 60 hours Fri morning - Mon morning / 15 CPU-minutes per curve * 8 CPUs)

2010-02-19, 02:58	#826
frmky Jul 2003 So Cal 2⁴·7·19 Posts	Code: prp51 factor: 388506058643583355437271607661833307213566452269017 prp77 factor: 32036182249699730203082985730853613751522637113555017710745413833553416908691

2010-02-19, 03:55	#827
jrk May 2008 2107₈ Posts	Now a c171 Code: 193180597261434437130723427223452983749001196443861486431050101233095959046579376056784397572419692971642911818089261513816572456073452501892312801518858596361529181158803

2010-02-19, 07:18	#829
Raman Noodles "Mr. Tuch" Dec 2007 Chennai, India 3×419 Posts	If this 171 digit number had been prime, the aliquot sequence would have acquired the downdriver now, right? @frmky (Greg): How many systems did you make use of in order to find out that p53 factor by using ECM, crack that c106 within half an hour crack that c128 within 5 hours of time Only 13 more iterations count for sequence 314718 to reach (hit) 9000 iterations is being left over! that is remaining actually... Last fiddled with by Raman on 2010-02-19 at 07:20

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2010-02-19, 08:24	#834
Joshua2 Sep 2004 13·41 Posts	i would think cpu time is better spent doing like ecm since gpus are faster at poly's I will do p-1 if no one else is.

2010-02-19, 11:04	#836
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 2³·11·73 Posts	I'm running 2000@11e7 over the weekend. (raman: 60 hours Fri morning - Mon morning / 15 CPU-minutes per curve * 8 CPUs)