20100412, 21:27  #1 
Apr 2010
2·3 Posts 
Range of Prime95?
Can Prime95 test a 215million digit number for primality?

20100412, 22:10  #2 
Oct 2008
n00bville
1011011000_{2} Posts 

20100412, 22:27  #3 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
1001001010101_{2} Posts 
Theoretically, maybe.
According to http://www.mersenne.org/primenet/ there are currently 2 LL tests with exponents in the 750M range  about 233M digits; through the years there have been many more at your size or bigger but none have ever finished. Practically ... NOT likely. The current supported maximum range for Prime95 is 596M or about 185M digits. Maybe others can explain how those larger assignments exist...could be they are using a program other than Prime95. Our current BEST theoretical benchmark would have an Intel i7980x running all 6 cores NONstop 2.5 years to test 596000000 ... I could only guess that it may take twice as long or more to complete your proposed test. Last fiddled with by petrw1 on 20100412 at 22:27 
20100412, 23:02  #4 
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
10AB_{16} Posts 
No, Prime95 can't run a number that big. It won't run LL on anything above 2^596M (179.4 million digits), which is probably the largest number that will work with the largest supported FFT size: 32M. As others have said, other programs might support larger sizes, but in any case, numbers that big would take years (at least without a supercomputer).
Is there a particular 215M digit number you're considering? What drew you to this number? Have you done any TF on this number? Prime95 or Factor5 (which supports multithreading) should work for that. That would be an easy way to prove it composite (if it is). Last fiddled with by MiniGeek on 20100412 at 23:06 
20100412, 23:10  #5  
Jul 2006
Calgary
5^{2}×17 Posts 
Quote:
Last fiddled with by lfm on 20100412 at 23:10 

20100412, 23:13  #6  
Apr 2010
2×3 Posts 
Quote:
I suspect that I will have to wait for the computers to get faster, or for a faster algorithm to be found... or something like that. Or start now and wait a few years... 

20100412, 23:15  #7  
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
17×251 Posts 
Quote:
If you have anything to show/suggest that it was you (or maybe even if you don't), you could email George to get it squared away: Or, I think 6 months is the time limit, so soon they should expire on their own. Last fiddled with by MiniGeek on 20100412 at 23:21 

20100412, 23:22  #8  
Jul 2006
Calgary
1A9_{16} Posts 
Quote:
It seems odd to me that this isn't automated yet. I thought there was some discussion about stuff over 90 days without a checkin would be released for reassignment. Maybe only applies to the more active ranges or something? 

20100413, 05:35  #9  
Jul 2005
Des Moines, Iowa, USA
252_{8} Posts 
i don't think it applies to manual assignments.
Quote:
Last fiddled with by S485122 on 20100413 at 05:40 Reason: added George Woltman quote 

20100413, 08:56  #10  
Banned
"Luigi"
Aug 2002
Team Italia
2×3×11×73 Posts 
Quote:
Luigi Last fiddled with by wblipp on 20100413 at 09:36 Reason: Requested moderation action finished. 

20100413, 09:45  #11  
Oct 2008
n00bville
2^{3}·7·13 Posts 
Quote:


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