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 2014-04-11, 09:49 #144 swellman     Jun 2012 B2A16 Posts I hit it with some ECM and it's now in GNFS (sieving). Should finish factoring Saturday night.
 2014-04-12, 20:48 #145 swellman     Jun 2012 2×1,429 Posts Now it's moved to a C132. Ran 900 curves at B1=1M with no factors found. Somebody take it.
2014-04-13, 08:48   #146
rajula

"Tapio Rajala"
Feb 2010
Finland

32×5×7 Posts

Quote:
 Originally Posted by swellman Now it's moved to a C132. Ran 900 curves at B1=1M with no factors found. Somebody take it.
Code:
Using B1=4528314, B2=4528314-8562077170, polynomial Dickson(6), sigma=1:1590548922
Step 1 took 15496ms
Step 2 took 5996ms
********** Factor found in step 2: 20563314438829833994736809392823600171
Found probable prime factor of 38 digits: 20563314438829833994736809392823600171
Probable prime cofactor 5822471939999663653675700987632417753596924497311978679187997966823194528620642268179424639277 has 94 digits

 2014-04-13, 19:46 #147 RichD     Sep 2008 Kansas 22×3×7×37 Posts C137 @ i2123 2^3 * 3^2 * ... * C137 ~400 @ 11e6 found the p42.
2014-04-18, 15:51   #148
prgamma10

Jan 2013

109 Posts

Quote:
 Originally Posted by RichD 2^3 * 3^2 * ... * C137 ~400 @ 11e6 found the p42.
I would take this C137.

 2014-04-20, 06:45 #149 prgamma10     Jan 2013 109 Posts C181 @ i2124 2^3 * 3^3 * ... * C181 2t40 done, no factor.
 2014-04-20, 07:48 #150 LaurV Romulan Interpreter     Jun 2011 Thailand 2×13×337 Posts Nice work all, with this sequence. Maybe it would be the time to abandon it, if ECM turns out fruitless? I mean, I was the guy who propose it and prop it in the beginning, but now I may be the guy to kill it I mean, over C180, GNFS is not something easy anymore, and we can concentrate the efforts on pushing other sequences higher. Let this sleep for a while, and in few years we will have better tools (i.e. accessible to "normal" guys like me) to attack it at a cheaper cost (time and electricity). Not that it wouldn't be enough sequences under 120 digits to pick up from... Last fiddled with by LaurV on 2014-04-20 at 07:49
2014-04-20, 10:09   #151
prgamma10

Jan 2013

1558 Posts

Quote:
 Originally Posted by LaurV Nice work all, with this sequence. Maybe it would be the time to abandon it, if ECM turns out fruitless? I mean, I was the guy who propose it and prop it in the beginning, but now I may be the guy to kill it I mean, over C180, GNFS is not something easy anymore, and we can concentrate the efforts on pushing other sequences higher. Let this sleep for a while, and in few years we will have better tools (i.e. accessible to "normal" guys like me) to attack it at a cheaper cost (time and electricity). Not that it wouldn't be enough sequences under 120 digits to pick up from...
+1.

Sound reasonable to me.

2014-04-22, 13:43   #152
prgamma10

Jan 2013

109 Posts

Quote:
 Originally Posted by prgamma10 2^3 * 3^3 * ... * C181 2t40 done, no factor.
t45 done, no factor.

2014-05-18, 11:04   #153
prgamma10

Jan 2013

109 Posts

Quote:
 Originally Posted by prgamma10 t45 done, no factor.
t50 done, no factor.

 2014-09-18, 15:39 #154 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT/BST) 2×2,861 Posts Everyone finished with this one? If so I will unsticky it.

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