20180112, 15:25  #1 
"Vasiliy"
Apr 2017
Ukraine
74_{8} Posts 
My luck
I didn't find 12digit factor after 1000 curves with B1=11000
What are the odds? Last fiddled with by vasyannyasha on 20180112 at 15:25 Reason: too many zeros 
20180112, 17:10  #2 
Apr 2010
Over the rainbow
101000000100_{2} Posts 
what number did you test?

20180112, 17:18  #3 
"Vasiliy"
Apr 2017
Ukraine
2^{2}×3×5 Posts 
111digit number from aliquot sequence

20180112, 17:20  #4 
"Vasiliy"
Apr 2017
Ukraine
3C_{16} Posts 
GMPECM write only about odds for 35digit factor and bigger.

20180112, 17:38  #5 
"Victor de Hollander"
Aug 2011
the Netherlands
2^{3}·3·7^{2} Posts 
Assuming you're testing a number in a normal range (100400 digits)
With GMPECM t20 = 86 curves with B1=11,000 B2=1,873,422 1000 curves = more than 11 x t20 So after 1000 curves you should've found a 20 digit factor 11 times on average. Chance to miss a 20 digit factor after 1000 curves is very small e^(11) = ~ 0.0000167 = 0.00167% Are you sure your software has compiled ok? Is the memory ok? Willing to share the number in question? So we can run a couple of hundred curves to check if GMPECM finds the factor on different hardware? Last fiddled with by VictordeHolland on 20180112 at 17:50 Reason: number? 
20180112, 17:52  #6 
"Vasiliy"
Apr 2017
Ukraine
2^{2}×3×5 Posts 
Before this I find dozens of different factors with ECM.
Memory work fine. Maybe this was bug for 30 seconds. After this P1 test used 2 GB and find this factor. Last fiddled with by vasyannyasha on 20180112 at 18:02 Reason: My English 
20180113, 17:51  #7  
Mar 2006
11×43 Posts 
Quote:
I think the differences in our numbers stems from GMPECM v7 recommending 106.7632 curves to find a 20digit factor with B1=11e3 with param=1. I think you might be using param=0. You can read more about my web page to calculate ecm success/failure chances here: http://www.mersenneforum.org/showthread.php?t=22924 Last fiddled with by WraithX on 20180113 at 17:53 

20180113, 18:28  #8  
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2^{2}·7·337 Posts 
Quote:
If your darts do not hit the dart board, the odds are that there could be a problem with darts, or with the dart board, or with the air between the darts and the darts board, or with the thrower of darts. (In no particular order.) 

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