20080720, 10:33  #56  
Quasi Admin Thing
May 2005
2×3×7×23 Posts 
Quote:
Kenneth! 

20080724, 08:03  #57 
May 2007
Kansas; USA
2^{7}×3^{4} Posts 
9675*256^418221 is prime
7788*256^421631 is prime Riesel base 256 is currently at n=44K; still going to n=75K. 40 k's are still remaining. One month ago and the larger prime would have been top5000. 3 months ago and they both would have been top5000. I should have started sooner. lol Gary Last fiddled with by gd_barnes on 20080724 at 08:04 
20080813, 05:09  #58 
May 2007
Kansas; USA
24200_{8} Posts 
Riesel base 256 is now complete to n=50K. 2 primes for n=40K50K previously reported.
Continuing on to n=75K after pausing for 23 weeks to continue Sierp base 12 from n=167K. 
20080906, 04:31  #59  
May 2007
Kansas; USA
2^{7}×3^{4} Posts 
Quote:
I've now restarted Riesel base 256 from n=50K...still going to n=75K. With some extra fire power now, I'll keep on running base 12 and 256 and possibly reserve some base 16 stuff within the next few weeks. Gary 

20080910, 23:00  #60 
May 2007
Kansas; USA
2^{7}×3^{4} Posts 
Riesel base 256 is now at n=54K. No new primes to report.

20080922, 01:17  #61  
May 2007
Kansas; USA
2^{7}×3^{4} Posts 
Quote:
Keep in mind that a test at n=100K will take FOUR times as long as a test at n=50K. If you give me the above info., I can, in effect, use the equivalent of compound interest formulas to give you a fairly accurate estimate of how long base 252 should take for n=51K100K. Gary Last fiddled with by gd_barnes on 20100516 at 08:32 Reason: remove base <= 250 

20080922, 05:34  #62  
Quasi Admin Thing
May 2005
2·3·7·23 Posts 
Quote:
KEP 

20080922, 05:53  #63  
May 2007
Kansas; USA
2^{7}·3^{4} Posts 
Quote:
A bit longer than 2 days. Even if all tests took the same amount of time, it would be 1045*2200/86400 = 26.6 CPU days or 6.65 days on all 4 cores of a quad. But clearly all tests don't take the same amount of time. To get to the original calculation, I assumed a constant rate of change in the nvalues being tested and a constant SQUARED rate of change in the time each test would take. So if n=52K takes 1045 secs., then n=52K*2=104K would take 1045*4=4180 secs. Also: n = 52K * sqrt(2) = 73.5K would take 1045*2=2090 secs. Obviously LLR time goes up in fits and spurts with fftlen changes so this can only be said to be a rough estimate. But it should be in the ball park since in the long run, LLR times varies with the square of the exponent. Gary Last fiddled with by gd_barnes on 20080922 at 06:00 

20081020, 18:01  #64 
Quasi Admin Thing
May 2005
966_{10} Posts 
Reserving Riesel base 255 for a future "Riesel base 255 attack". I expect it to overtake the "Riesel base 3 attack" website. I've already begun some initial testings and it seems very prime dense, so I will have no problem running this conjecture up to PG level, if Rytis wanna help out. Expect by no terms any further work from me beyound k<=500M to n<=25K for Riesel base 3 conjecture. It turns out to be to much of a handfull for me to handle, I still like the conjectures, so therefor I'm doing the initial preparations to launch a fullscale attack on the Riesel base 255 conjecture
Hope no one mind. Also I'm gonna need something to keep my computers busy as they slowly runs out of work for previously reservations Regards KEP! 
20081020, 21:32  #65  
May 2007
Kansas; USA
2^{7}×3^{4} Posts 
Quote:
Didn't you test Sierp base 255 up to n=2500? Do you remember how long it took for you to get that tested? Now, you're going to test the Riesel side with a conjecture that is twice as high? You are correct, it seems that all bases (b) where b=2^q1, i.e. 3, 7, 15, 31, etc. are prime dense but because they are so primeful, they also have very high conjectures vs. their neighbor bases, which makes them more difficult to prove then a large majority of other bases. I have 3 alternatives for you if you want to test base 255 up to PrimeGrid level in a reasonable amount of time: (a) Do Sierp base 255 instead. It's already at n=2500 and the conjecture is half as high. (b) Start a new thread here at CRUS and attempt to get some help testing Riesel base 255. (c) Buy several new quads. (lol) Even if you do (a), you'll likely still need to enlist some help here at some point. Gary 

20081021, 16:42  #66  
Quasi Admin Thing
May 2005
3C6_{16} Posts 
Quote:
Take care everyone and happy crunching KEP Last fiddled with by KEP on 20081021 at 17:37 Reason: Corrected a bad reservation before it got reserved 

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