20110810, 02:38  #1 
Aug 2011
Austin, TX
3 Posts 
Can I just leave this here? (ECPP)
If anybody's interested, you'll need WraithX's program to verify the certificate and you'll need to modify lines 64 through 67 to make it work (change 10000 to something more appropriate, like 40000).
I'm working on 60k digits next, but I have no idea when that will happen. It's probably going to take a while. 
20110811, 00:47  #2  
Dec 2010
Monticello
1795_{10} Posts 
Quote:


20110811, 01:16  #3  
Aug 2011
Austin, TX
3 Posts 
Quote:
Primo caps out at about 30000 decimal digits for certificate verification, so you'll need to use another program to verify it. WraithX posted a program that verifies Primo certificates back in October 2010, but for this certificate, you have to tweak a few lines in the source code to get the program to accept larger input sizes. I'm hoping to have a certificate for a number with about 60000 digits soon, but I have no idea how long it will take to do this. 

20110815, 16:30  #4 
Sep 2009
3551_{8} Posts 
What program are you using to create the certificates? Is it publicly available, if so where? It would be nice to be able to prove R49081 is prime.
WraithX's program is available in this thread http://www.mersenneforum.org/showthread.php?t=14086 which should save other people some searching. Chris K 
20110817, 16:46  #5 
Sep 2009
7·271 Posts 
Another question, did you start with a number and generate a certificate or did you build a certificate and see what number it was for?
Chris K 
20110817, 23:35  #6  
Aug 2011
Austin, TX
3 Posts 
Quote:
It's pleasantly surprising to see how amenable the CM method is to being run "in reverse". If you're smart about it, it's pretty easy to generate numbers in the 10kdigit and 20kdigit range. I don't know of any way to pick the final certified value; all the obvious methods related to my approach are impractical. I'm currently doing this as part of my undergrad research project; I'm hoping to at least make SOME progress toward the goal of being able to pick the ending value. 

20110819, 16:34  #7 
Sep 2009
1897_{10} Posts 
OK, so it's not as useful as I hoped. But it's a good test for WraithX's code.
Chris K 
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