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Old 2014-05-13, 21:52   #1
XYYXF
 
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Default 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 2015-02-02 at 15:04 Reason: update
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Old 2014-05-14, 22:22   #2
ET_
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Quote:
Originally Posted by XYYXF View Post
As of April 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)

Three more had been tested up to t55 (18k@110M):
C302_149_110
C307_149_120
C303_150_119

And the least four were brought only to t50 (7600@43M):
C300_141_133
C301_143_129
C300_145_136
C301_148_131

Their decimal expansion is available there: http://xyyxf.at.tut.by/cmplist.txt

It would be fine to rain down more ECM power on them :-)
I guess most of them (thiose under 1018 bits) could be treated with GPU-ECM...

Luigi
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Old 2014-05-15, 20:18   #3
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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.
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Old 2014-05-21, 00:46   #4
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ryanp is reserving C300_141_133.
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Old 2014-05-28, 21:40   #5
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18432@110M on C300_145_136 completed, no factor found.
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Old 2014-05-28, 23:29   #6
XYYXF
 
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Thank you Tom :)
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Old 2014-10-23, 02:17   #7
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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.
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Old 2014-10-23, 02:44   #8
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I'll do it. I'd imagine a couple of weeks for me as well.
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Old 2014-10-23, 16:17   #9
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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.
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Old 2014-10-23, 16:35   #10
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Sounds good.
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Old 2014-10-23, 17:26   #11
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Smaller curves have a better chance _if_ the factor is in that range (50-55 digits).
And, the t55 is not complete yet, so you have a fair chance.

For the full t55, it would have taken you a core-year (e.g. 4 cores * 3 months).
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