mersenneforum.org Riesel Primes k*2^n-1, k<300 [Part II]
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2021-07-24, 00:03   #1035
ryanp

Jun 2012
Boulder, CO

42510 Posts

Quote:
 Originally Posted by gd_barnes k=7 is complete to n=5M; double-check is complete for n=1M-4.23M. No primes found for n=1M-5M. The k is released. Results attached. This is likely the longest currently running n-range without a prime for k<300.
I'm taking k=7 from n=5M to n=8M. Already found a hit.

2021-07-24, 21:37   #1036
gd_barnes

"Gary"
May 2007
Overland Park, KS

22×13×227 Posts

k=21 is complete to n=3.5M; 1 prime found for n=2.89M-3.5M.

k=21 double-check is complete for n=1M-2.89M; 5 primes confirmed.

The k is released. Primes and results attached.
Attached Files
 prime-riesel-base2-k21-1M-3.5M.txt (368 Bytes, 110 views) results-riesel-base2-k21-1M-3.5M.zip (1.15 MB, 120 views)

 2021-07-27, 21:52 #1037 japelprime     "Erling B." Dec 2005 10410 Posts k=83 at n=3.6M and continuing
 2021-09-09, 15:30 #1038 Trilo     "W. Byerly" Aug 2013 81*2^3174353-1 8516 Posts k=55 at n=3.45m.
 2021-09-27, 15:30 #1039 Trilo     "W. Byerly" Aug 2013 81*2^3174353-1 8516 Posts Reserving k=21 from 3.5m Building a new computer (Ryzen 5950x) on Friday excited to get it crunching!
 2021-10-01, 11:50 #1040 kuratkull     Mar 2007 Estonia 149 Posts ongoing progress report: k=193 at n=5M k=195 at n=5M k=197 at n=5M
 2021-10-21, 23:53 #1041 Trilo     "W. Byerly" Aug 2013 81*2^3174353-1 7·19 Posts In contact with ryanp as it seems he was working on k=21 before me. Reserving k= 81 instead.
2021-10-21, 23:58   #1042
diep

Sep 2006
The Netherlands

2×13×31 Posts

Quote:
 Originally Posted by Trilo In contact with ryanp as it seems he was working on k=21 before me. Reserving k= 81 instead.
k=81 might be a good one! Good luck! (had told Paul to jump on it - too late now!)

Last fiddled with by diep on 2021-10-21 at 23:59

2021-10-22, 02:11   #1043
Trilo

"W. Byerly"
Aug 2013
81*2^3174353-1

7·19 Posts

after speaking with ryanp he completed k= 21 from n=6-7m. I'll keep k=21 reserved along with k=81.

k=55 at n= 3.52m.

Quote:
 Originally Posted by diep k=81 might be a good one! Good luck! (had told Paul to jump on it - too late now!)
Only time will tell ;)

Last fiddled with by Trilo on 2021-10-22 at 02:17

 2021-11-11, 01:08 #1044 unconnected     May 2009 Moscow, Russia 55108 Posts Status update: k=29 @ 7M k=253 @ 6.2M
 2021-11-14, 12:11 #1045 japelprime     "Erling B." Dec 2005 23×13 Posts k=83 at n=3.7M and continuing.

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