20050131, 17:42  #298 
Apr 2004
10110111_{2} Posts 
91 riesel
91 is completed from 210000 to 300000, & prime for 245989!
Harvey563 
20050204, 01:32  #299 
Nov 2004
Canada
101_{2} Posts 
Speaking of 91...
Number 91 on the top 5000 is now 9*2^8287091, which was proven prime earlier today!
The k=9 search had been primeless for 6 months. Other recent finds: 129*2^2925731 129*2^3106191 129*2^3141881 129*2^3313841 
20050205, 08:24  #300 
Nov 2003
2·1,811 Posts 
Congrats on a big, top100 prime!

20050205, 19:35  #301 
May 2004
2^{2}·7 Posts 
k=231 checked through n=310000 and is prime for
231*2^2050171 231*2^2242971 231*2^2483591 Tests on 237 and 241 going on ... EDIT: I stop 231 at n=310k EDIT2: Attached is the sieve file with the numbers not tested yet to n=500k for k=231 Last fiddled with by Keller on 20050205 at 19:40 
20050213, 14:34  #302 
Nov 2003
7046_{8} Posts 
Recent Progress
Recently found primes and achieved limits are given below.
k=55: 397941 [400000] k=71: 735802 prover's code L97 [736000] k=79: 369535 [370000] k=89: 369628 [380000] 
20050213, 14:42  #303 
Nov 2003
E26_{16} Posts 
Is anybody interested in working on k=231 using presieved values kindly provided by Keller above? If so, please announce your intentions in this thread. And please report primes (if any) by including "15k Search" in your prover's code.

20050214, 00:33  #304 
Nov 2004
California
2^{3}·3·71 Posts 
I'll take up the k=231 values and report back.
(looks like n goes up to 400k and not 500k. I'll finish LLR up to 400k and sieve if it's still promising). Last fiddled with by lsoule on 20050214 at 00:41 
20050215, 13:47  #305 
Nov 2004
California
2^{3}×3×71 Posts 
Found a prime with 231:
k=231: 345183 [complete to 318k] 
20050215, 18:17  #306 
Feb 2003
1,907 Posts 
k=75
Seems as if no one is currently looking at k=75 (formerly tested by keller up to n=250000).
So, I'll take it a bit higher. Please let me know, if someone else has already choosen that k.  Thomas11 By the way: k=29 is tested through n=1.2M now! 
20050222, 02:25  #307 
Nov 2004
California
2^{3}·3·71 Posts 
231*2^3695831 is prime
231 is now complete to 400k and continuing. Larry 
20050228, 13:45  #308 
Jun 2003
Oxford, UK
2·7·137 Posts 
Nice big one
Here is a note from Chris Caldwell's list:
220a 15*2^5687801 171222 L52 2005 That is my second big prime from k=15 and my largest yet! Regards Robert Smith 
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