Reserved for MF - Sequence 4788 - Page 220

axn · 2016-02-20, 11:16

Quote:

Originally Posted by Dubslow

Edit: I'd done 5792@260e6 vs 4330@260e6 from yoyo@home

Hmmm... Somethin's fishy. What's the probability that a p53 will resist this many curves?

VBCurtis · 2016-02-21, 05:05

Quote:

Originally Posted by axn

Hmmm... Somethin's fishy. What's the probability that a p53 will resist this many curves?

10k curves at 260M is just under 1.2*t55, so a p53 would be found ~2.3 times over, on average. I guess you could say 1 out of e^2.3 p53s would resist that many curves? So, like 8% of the time?

I think the 110M level was mostly skipped for this number, jumping straight from a t50 to curves at 260M, so it's not as crazy a miss as it seems on first glance.

Dubslow · 2016-02-21, 06:55

Quote:

Originally Posted by VBCurtis

10k curves at 260M is just under 1.2*t55, so a p53 would be found ~2.3 times over, on average. I guess you could say 1 out of e^2.3 p53s would resist that many curves? So, like 8% of the time?

I think the 110M level was mostly skipped for this number, jumping straight from a t50 to curves at 260M, so it's not as crazy a miss as it seems on first glance.

4K@110e6, 10K@260e6. Not the craziest miss in the world. I prefer to think of it as a lesson on why we don't halfheartedly sorta-kinda-not-really complete the calculated amount of ECM. More than once I was tempted to say "screw it" and go download CADO...

Any word on 5236:C195?

swellman · 2016-02-21, 16:31

Quote:

Originally Posted by Dubslow

Any word on 5236:C195?

Did you run any ECM on it after fully factoring i5235? It will need up to at least t60+, possibly a sizable fraction of t65. I'm willing to help with some of the lower tier ECM but can't start for a few days.

Dubslow · 2016-02-21, 18:08

Quote:

Originally Posted by swellman

Did you run any ECM on it after fully factoring i5235? It will need up to at least t60+, possibly a sizable fraction of t65. I'm willing to help with some of the lower tier ECM but can't start for a few days.

Although my factorization finished, I was away from the computer at the time. Someone else had already completed and reported 5235, so I haven't touched 5236.

unconnected · 2016-02-21, 18:32

I did 4400@11e6 and 2000@43e6 on the C195.

henryzz · 2016-02-23, 16:57

Given how many numbers we look at 8% will happen fairly often.

unconnected · 2016-02-24, 06:25

Quote:

Originally Posted by unconnected

I did 4400@11e6 and 2000@43e6 on the C195.

+1800@43e6

unconnected · 2016-03-01, 07:58

+3600@43e6

Total curve count from me: 4400@11e6 and 7400@43e6.
Someone plans to do some curves @11e7 or we'll ask yoyo for help?

swellman · 2016-03-01, 17:36

I've dropped yoyo a note about this thread. Hoping they can bring some help.

What level of ECM does this number eventually require before swapping to GNFS? A full t65?

yoyo · 2016-03-01, 20:43

Thanks for the pm. I sent now 18000 curves @11e7 to the minions.

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2016-02-21, 18:32	#2415
unconnected May 2009 Russia, Moscow A21₁₆ Posts	I did 4400@11e6 and 2000@43e6 on the C195.

2016-02-23, 16:57	#2416
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 2·3³·109 Posts	Given how many numbers we look at 8% will happen fairly often.

2016-03-01, 07:58	#2418
unconnected May 2009 Russia, Moscow 2,593 Posts	+3600@43e6 Total curve count from me: 4400@11e6 and 7400@43e6. Someone plans to do some curves @11e7 or we'll ask yoyo for help?

2016-03-01, 17:36	#2419
swellman Jun 2012 3091₁₀ Posts	I've dropped yoyo a note about this thread. Hoping they can bring some help. What level of ECM does this number eventually require before swapping to GNFS? A full t65?

2016-03-01, 20:43	#2420
yoyo Oct 2006 Berlin, Germany 7×89 Posts	Thanks for the pm. I sent now 18000 curves @11e7 to the minions.