20130118, 20:07  #364 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
21646_{8} Posts 
You are right  I should have looked in the .cr file again. :)
It is indeed a backtrack. Code:
[Setup] MaxConcurrentTasks=8 SieveUpperBound=2^32 [Backtrack] Count=1 [1, backtrack:1] Type=4 Gain=3 Index=1.10120 D=335755 H/G=96/8:12 [1] Type=4 Gain=62 Index=1.30522 D=1904820 H/G=320/16:20 
20130515, 14:34  #365 
Jun 2009
2×5×67 Posts 

20130515, 19:48  #366 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
21646_{8} Posts 
No, indeed, I got lucky with 123 and then backtracked. I don't think I got to 10. I can search for that folder...
The newer and newer Primo version are probably increasingly better trained for larger and larger sizes; so the later you start, the better chances are to arrive earlier. 
20130515, 20:12  #367 
Jun 2009
2×5×67 Posts 
Never mind searching for the folder. I won't get near that box for several days now, so it will just run its course anyway.
Backtracking can be manipulated via the primo.ini file so I might have to do that and start once again. We'll see. 
20131203, 16:20  #368 
Jun 2009
2·5·67 Posts 
Who feels motivated to run a verification?
http://www.sendspace.com/file/hxjfvg EDIT: Marcel Martin has added new/more/better discriminants to one of his latest releases, so maybe 2^73360+10711 is doable now. I'll leave that to others though. Last fiddled with by PuzzlePeter on 20131203 at 16:26 
20131203, 17:19  #369 
Sep 2002
Database er0rr
2^{2}·23·37 Posts 
Congrats for the top Primo proof of 2^73845 + 14717
Pray tell us, what are the specs of the hardware used? Last fiddled with by paulunderwood on 20131203 at 17:21 
20131203, 18:19  #370  
"Phil"
Sep 2002
Tracktown, U.S.A.
2135_{8} Posts 
Quote:
Congratulations, Peter, it looks like you started in May? How many cores? 

20131203, 18:22  #371 
Jun 2009
1010011110_{2} Posts 
Most of the proof was done on a dual Xeon machine with 16 threads on 16 physical cores. I found a 1:1 ratio to be the fastest.

20140515, 17:12  #372 
Jun 2009
2·5·67 Posts 
Just for fun I tried 2^73360+10711 once again with PRIMO 4.10. This version was successful in test1 thanks to the new discriminant tables. It will be an onandoff job, but I will continue this run unless somebody else would rather do it.

20140531, 13:13  #373 
"W. Byerly"
Aug 2013
1423*2^21790231
2×47 Posts 
How long does it take to prove these numbers prime?

20140531, 16:31  #374 
Jun 2009
2×5×67 Posts 
Using good hardware (16 physical cores in a dualXEON box) it's about 3 to 4 months going 24/7. Runtime depends heavily on how much backtracking is needed, especially in the beginning when one backtrack can easily cost 2 days, so it's hard to give a precise estimate.

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