20140513, 21:52  #1 
Jan 2005
Minsk, Belarus
110010000_{2} Posts 
Fourteen or Bust, or ECM attack on C300+
As of December 2014, there were 14 composites having 300 or more decimal digits. Half of them are sheduled to run t65 by yoyo@home:
C305_142_139 (the only composite without cofactor) C310_147_142 C311_148_133 C313_148_139 C316_149_132 C321_149_146 (the largest composite in the project) C304_150_149 (the largest Leyland number in the project) Two more are on the way to t60: C300_141_133 (5k+ curves @260M) C301_148_131 (20k curves@260M) Others had been tested at least up to t55 (18k@110M): C301_143_129 C300_145_136 C302_149_110 C307_149_120 C303_150_119 Their decimal expansion is available there: http://www.primefan.ru/xyyxf/cmplist.txt It would be fine to rain down more ECM power on them :) Last fiddled with by XYYXF on 20150202 at 15:04 Reason: update 
20140514, 22:22  #2  
Banned
"Luigi"
Aug 2002
Team Italia
29×167 Posts 
Quote:
Luigi 

20140515, 20:18  #3 
(loop (#_fork))
Feb 2006
Cambridge, England
2·7·461 Posts 
OK, I will try raining 18432@110M on C300_145_136 using a GPU. It will take about nine days, plus maybe five days on 36 threads for stage 2.

20140521, 00:46  #4 
Jun 2012
111001101011_{2} Posts 
ryanp is reserving C300_141_133.

20140528, 21:40  #5 
(loop (#_fork))
Feb 2006
Cambridge, England
2·7·461 Posts 
18432@110M on C300_145_136 completed, no factor found.

20140528, 23:29  #6 
Jan 2005
Minsk, Belarus
2^{4}×5^{2} Posts 
Thank you Tom :)

20141023, 02:17  #7 
Jun 2012
3,691 Posts 
As all of my ECM reservations are about to finish, I'd like to take C301_143_129 to t55. It will take a few weeks.
Anybody want to tackle C301_148_131? It's the last one. 
20141023, 02:44  #8 
I moo ablest echo power!
May 2013
17×107 Posts 
I'll do it. I'd imagine a couple of weeks for me as well.

20141023, 16:17  #9 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
26D6_{16} Posts 
I ran 6000 B1=260M curves on C301_148_131 and will run 6000 more. That will take care of the t55, but you can run some 110M curves too.

20141023, 16:35  #10 
I moo ablest echo power!
May 2013
17·107 Posts 
Sounds good.

20141023, 17:26  #11 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2×3×1,657 Posts 
Smaller curves have a better chance _if_ the factor is in that range (5055 digits).
And, the t55 is not complete yet, so you have a fair chance. For the full t55, it would have taken you a coreyear (e.g. 4 cores * 3 months). 
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