Fourteen or Bust, or ECM attack on C300+

XYYXF · 2014-05-13, 21:52

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 :-)

ET_ · 2014-05-14, 22:22

Quote:

Originally Posted by XYYXF

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

fivemack · 2014-05-15, 20:18

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.

swellman · 2014-05-21, 00:46

ryanp is reserving C300_141_133.

fivemack · 2014-05-28, 21:40

18432@110M on C300_145_136 completed, no factor found.

XYYXF · 2014-05-28, 23:29

Thank you Tom :)

swellman · 2014-10-23, 02:17

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.

wombatman · 2014-10-23, 02:44

I'll do it. I'd imagine a couple of weeks for me as well.

Batalov · 2014-10-23, 16:17

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.

wombatman · 2014-10-23, 16:35

Sounds good.

Batalov · 2014-10-23, 17:26

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).

2014-05-13, 21:52	#1
XYYXF Jan 2005 Minsk, Belarus 620₈ 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 2015-02-02 at 15:04 Reason: update

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Nuke attack - run or hide?	MooMoo2	Soap Box	40	2018-01-19 23:48
Let's attack the Bayesian-ECM-bounds again	fivemack	Math	33	2017-02-10 00:10
GPU attack on double Mersennes?	Uncwilly	GPU Computing	29	2013-09-08 20:53
Attack of the Cosmic Rays	S485122	Hardware	3	2010-08-24 01:19
Attack of the Killer Zombies	ewmayer	Lounge	12	2007-01-30 05:56

2014-05-15, 20:18	#3
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 7²·131 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.

2014-05-21, 00:46	#4
swellman Jun 2012 2²·13·59 Posts	ryanp is reserving C300_141_133.

2014-05-28, 21:40	#5
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 1100100010011₂ Posts	18432@110M on C300_145_136 completed, no factor found.

2014-05-28, 23:29	#6
XYYXF Jan 2005 Minsk, Belarus 2⁴×5² Posts	Thank you Tom :)

2014-10-23, 02:17	#7
swellman Jun 2012 3068₁₀ 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.

2014-10-23, 02:44	#8
wombatman I moo ablest echo power! May 2013 29×61 Posts	I'll do it. I'd imagine a couple of weeks for me as well.

2014-10-23, 16:17	#9
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 3⁶×13 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.

2014-10-23, 16:35	#10
wombatman I moo ablest echo power! May 2013 1769₁₀ Posts	Sounds good.

2014-10-23, 17:26	#11
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 3⁶×13 Posts	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).