20140411, 09:49  #144 
Jun 2012
B2A_{16} Posts 
I hit it with some ECM and it's now in GNFS (sieving). Should finish factoring Saturday night.

20140412, 20:48  #145 
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.

20140413, 08:48  #146  
"Tapio Rajala"
Feb 2010
Finland
3^{2}×5×7 Posts 
Quote:
Code:
Using B1=4528314, B2=45283148562077170, 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 

20140413, 19:46  #147 
Sep 2008
Kansas
2^{2}×3×7×37 Posts 
C137 @ i2123
2^3 * 3^2 * ... * C137
~400 @ 11e6 found the p42. 
20140418, 15:51  #148 
Jan 2013
109 Posts 

20140420, 06:45  #149 
Jan 2013
109 Posts 
C181 @ i2124
2^3 * 3^3 * ... * C181
2t40 done, no factor. 
20140420, 07:48  #150 
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 20140420 at 07:49 
20140420, 10:09  #151  
Jan 2013
155_{8} Posts 
Quote:
Sound reasonable to me. 

20140422, 13:43  #152 
Jan 2013
109 Posts 

20140518, 11:04  #153 
Jan 2013
109 Posts 

20140918, 15:39  #154 
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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