20130917, 20:26  #1 
Sep 2006
The Netherlands
787 Posts 
69 * 2^n  1
Where is the current search located at 69 * 2^n  1?
I saw on homepage report of 2416k. I'll take over from there. Where can i find all results so far (factorisation results, sieving results etc)? Kind Regards, Vincent Diepeveen diep@xs4all.nl 
20130918, 02:42  #2 
"Curtis"
Feb 2005
Riverside, CA
1010110111101_{2} Posts 
69 is part of the "First Megabit Drive", and is searched as part of that drive. If you'd like to search for primes at that level, simply reserve a file or two from that thread it's stickied near the top of the forum.

20130918, 09:24  #3 
Sep 2006
The Netherlands
787 Posts 
Oh we have a few tflop idle here and like to search 1 prime deeply. Seeing megadrive not very active yet i'll pick a different one otherwise.

20130918, 10:00  #4 
Nov 2003
2·1,811 Posts 
Can you start k=69 from n=2500k? We'll remove k=51 from the drive at 2500k (already being tested by Retep) and at the same time we can remove k=69 as well.
Thanks! 
20130918, 10:03  #5 
Sep 2006
The Netherlands
787 Posts 

20130918, 10:06  #6 
Sep 2006
The Netherlands
313_{16} Posts 
Until where did this range get double checked or is it entirely single checked?

20130918, 11:51  #7 
Nov 2003
7046_{8} Posts 
k=69 is completely checked from n=1 up to n=2416k.
Double check was done from n=1 up to n=100k by D. Broadhurst. All known primes for all k<300 are listed here. Current limits are given as well (they may not be up to date for k=1, 3, 27, and 121). Thanks for your interest and happy hunting! ps. Please inform us about your progress from time to time, and attach your results if possible. And we'll appreciate if you include our project RPS (Riesel Prime Search) in you prover's code when you report primes. Last fiddled with by Kosmaj on 20130918 at 11:56 
20130918, 18:34  #8 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
1400_{16} Posts 
Why this k?

20130918, 18:55  #9 
Sep 2006
The Netherlands
787 Posts 
Wagstaff gets 69 next year, hopefully PrimeGrid will celebrate that with a massive sprint at Wagstaff to the next PRP there, directly after Jeff Gilchrist finishes 10M, we'll collect everything then and ship it to PG hoping for that anniversary celebration :)

20130925, 16:57  #10 
Sep 2006
The Netherlands
787 Posts 
Update 25 september: busy sieving 2500k  10M.
Will take some time. 
20130925, 17:13  #11  
"Dave"
Sep 2005
UK
2^{3}·347 Posts 
Quote:

