mersenneforum.org Riesel Primes k*2^n-1, k<300 [Was "k=1"]
 Register FAQ Search Today's Posts Mark Forums Read

 2004-12-24, 16:16 #276 Kosmaj     Nov 2003 2·1,811 Posts Recent Progress I completed k=57, 61, 83, 85, and 87 to 400k. I found the following primes: 61*2^384287-1 87*2^353734-1 87*2^360829-1 87*2^382268-1 I'm continuing work on k=67, 85, and 87. I'd like to reserve k=79 from 300k and k=71 from 417k. I'm also working on k=7, 21, 55, and 77. I'm releasing, for the time being, k=57, 61 and 83.
 2004-12-24, 19:44 #277 Harvey563     Apr 2004 101101112 Posts 219,221,223,227 to 210000 I checked k=219, 221, 223, & 227 from 200000 to 210000 with no primes found. k=243 is checked to 230000 with no new primes. Harvey563
 2004-12-27, 22:22 #278 cyrix   Jul 2003 Thuringia; Germany 2·29 Posts Hi, I'd like to work on k=105 a little bit further. Cyrix
 2004-12-28, 00:24 #279 JCS   Nov 2004 Canada 5 Posts Hi Cyrix, I am nearly done checking 105 up to 500,000. With only 1600 n's remaining, there have been no new primes since n=280022. Fairness would dictate that I'm long overdue for another prime, but then we know that large primes are anything but fair. You're welcome to join me for the last few laps. I have also completed k=255 from 260,000 to 320,000. There was only one new prime, for n=281366. For a dense, low k candidate, you may want to look at k=69. It has 68 primes for n less than 200k, and 7 primes between 200k and 500k. Jeffrey
 2004-12-30, 15:59 #280 Kosmaj     Nov 2003 E2616 Posts Cyrix You can also consider k=75, it appears to be reasonably populated with primes and it's checked only to n=250k. My last progress report in 2004: k=7, [1.1 M] k=21, [880k] k=55, [350k] k=77, 77*2^607920-1 is prime, continuously checked to 575k I'd also like to cancel k=71 since it's already processed to more than 600k by a third party.
 2005-01-04, 17:38 #281 Harvey563     Apr 2004 3·61 Posts k=91, 200000 to 210000 I have checked k=91, from 200000 to 210000 & found no primes. I am checking k=93, from 200000 to 210000. I plan to continue checking whatever k values seem to be unchecked from 200000 to 210000[on the 15k Riesel list.] Please let me know if you've already checked k=93, 95,97,99, 107, 111, ... from 200000 to 210000. Thanks. Harvey563
 2005-01-04, 19:14 #282 masser     Jul 2003 wear a mask 52·61 Posts k=111, 123, 153, 159, 171, 183, 189, 219, 225 Hi Harvey, I'm almost finished testing the following k values over the range n=200K-300K: k=111, 123, 153, 159, 171, 183, 189, 219, 225 I'll list the results here in a week or so. Best regards, masser
 2005-01-05, 02:55 #283 Kosmaj     Nov 2003 2·1,811 Posts Harvey, Check also the list of searched intervals compiled by Keller. Some people report only to him. While some others report to nobody...
 2005-01-06, 18:08 #284 masser     Jul 2003 wear a mask 52·61 Posts some results Hi all, Here are some results for several k values: k=111: 217034, 279227, currently at n=300000 k=123: no new primes to report, currently at n=380000 k=153: no new primes to report, currently at n=300000 k=159: 293235, currently at n=300000 k=171: 259262, 269539, 290403, currently at n=300000 k=183: no new primes to report, currently at n=300000 k=189: 213856, 235068, 237968, 239891, 246356, 255372, currently at n=300000 k=219: no new primes to report, currently at n=300000 k=225: 206293, currently at n=300000 I will continue testing these 9 k-values up to n=400 or 500 K. best regards, masser
 2005-01-08, 10:38 #285 Keller   May 2004 111002 Posts I would like to reserve k=195 but cant tell how deep I will be able to test it ... I hope to get it to n=500k :) Last fiddled with by Keller on 2005-01-08 at 10:38
 2005-01-08, 13:08 #286 Keller   May 2004 348 Posts Yes, that's 195*2^311215-1 found by Shane. It will be nice if he can tell us what range did he checked. On our table currently the limit is 250k, and on Wilfrid Keller's list it's 267k. Last fiddled with by Kosmaj on 2005-01-08 at 15:09

 Similar Threads Thread Thread Starter Forum Replies Last Post CRGreathouse Number Theory Discussion Group 51 2018-12-16 21:55 URoy Miscellaneous Math 15 2016-11-17 22:52 Batalov And now for something completely different 12 2014-11-16 19:03 Kosmaj Riesel Prime Search 21 2012-09-14 09:51 nitai1999 Software 7 2004-08-26 18:12

All times are UTC. The time now is 07:56.

Sat Jan 23 07:56:33 UTC 2021 up 51 days, 4:07, 0 users, load averages: 1.60, 2.27, 2.44