mersenneforum.org Riesel Primes k*2^n-1, k<300 [Was "k=1"]
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 2004-08-31, 21:38 #265 Kosmaj     Nov 2003 2×1,811 Posts Thomas, CONGRATS! The k=3 huge prime yesterday and the k=11 one today, you cannot deny that these two days have been very lucky for you. Happy hunting! (btw, where are those smilies, cannot find them...)
 2004-09-06, 13:42 #266 robert44444uk     Jun 2003 Oxford, UK 2·7·137 Posts 15 For the group's information, 15 is now at 505000 with no further primes. Sadly I have this running on a very slow machine. Regards Robert Smith
 2004-09-13, 19:25 #267 Thomas11     Feb 2003 1,907 Posts 11*2^743322-1 is prime!
 2004-10-11, 08:41 #268 Kosmaj     Nov 2003 2·1,811 Posts My recent progress k=7, checked to n=1012000, in progress k=13, to 1000000 (1M), stopped k=21, to 760000, in progress k=35, 35*2^252910-1 is prime, checked to 360000, in progress k=53, to 520000, stopped k=77, 77*2^387680-1 is prime, checked to 388000, in progress Happy hunting to all!
 2004-10-25, 21:10 #269 Kosmaj     Nov 2003 2·1,811 Posts k=77 77*2^441528-1 is prime! k=77 checked to 450000, continuing.
 2004-11-03, 00:56 #270 Kosmaj     Nov 2003 2×1,811 Posts I'd like to congratulate Jeffrey (L38) on many primes he found recently, including the just reported 47*2^450470-1 but I think it will be nice if he can post here the ranges he processed and the ranges he is working on now so that the others can better decide which k to check next. I see that he is actually informing Joss directly (as I don't remember he ever posted in this thread) but with a large delay. I wanted to mail him and tell him this directly but he has no e-mail address listed on his Top-5000 biography page. Posting above info will be greatly appreciated and will help the progress of the project. We have others not reporting either, like g267 (Grobstich) on k=17, 63, 65 and possibly other k's and L33 (Chaglassian) on k=73, 103 etc. but there is little we can do about that.
 2004-11-05, 01:23 #271 Kosmaj     Nov 2003 70468 Posts I'm now working on k=55 and after some quick tests I found that 55*2^218043-1 is prime. Current status: k=55, to 220k, in progress k=21, to 820k, in progress k=35, to 420k, stopped k=77, to 480k, in progress Happy crunching!
 2004-11-05, 16:50 #272 Harvey563     Apr 2004 101101112 Posts update Here's my recent activity: 243*2^206302-1 is prime! 241*2^n-1 200000 to 230000 11/3/4 [none] completed 243*2^n-1 200000 to 219000 11/5/4 [206302] continuing to 230000 245*2^n-1 200000 to 230000 11/2/4 [none] completed 247*2^n-1 200000 to 230000 11/1/4 [none] completed 249*2^n-1 200000 to 230000 11/1/4 [none] completed Harvey563
2004-11-28, 14:12   #273
JCS

Nov 2004

5 Posts

Quote:
 Originally Posted by Kosmaj I'd like to congratulate Jeffrey (L38) on many primes he found recently, including the just reported 47*2^450470-1 but I think it will be nice if he can post here the ranges he processed and the ranges he is working on now so that the others can better decide which k to check next.
Thanks! Ok, here goes. My upper limit is n=500k, except for k=9.

k=9: at 744k
k=33: at 410k
k=43: complete to 500k
k=51: at 475k (51*2^468417-1 is prime!)
k=59: at 360k (59*2^358276-1 is prime!)
k=69: complete to 500k
k=105: at 430k
k=117: at 363k

Completed previously: 47 (500k), 101 (500k), 109 (350k), 119 (500k), 289 (300k)

Jeffrey

 2004-11-30, 19:08 #274 SlashDude     Aug 2002 Minneapolis, MN 22×3×19 Posts Update on k=23 I have tested this one to n=1,000,000! I am still testing it to higher n's
 2004-12-04, 13:13 #275 Kosmaj     Nov 2003 2×1,811 Posts Progress Report Status of k's reserved before: k=7: [to n=1050000] in progress k=21: [850000] continuing to 1M k=55: prime for n=253047 [280000] continuing to 520k k=77: [520000] in progress The following 7 k's I've been testing in the 210-400k range. k=57: 239854 [330000] k=59: 358276 already reported by JCS [400000] k=61: [280000] k=67: [400000] k=83: 216954 [260000] k=85: [370000] k=87: [310000] I "collided" with JCS at k=59 but I was using a machine without permanent access and I couldn't stop it earlier. Last fiddled with by Kosmaj on 2004-12-04 at 13:14

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