mersenneforum.org Riesel Primes k*2^n-1, k<300 [Was "k=1"]
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 2005-03-29, 18:52 #320 robert44444uk     Jun 2003 Oxford, UK 111011111102 Posts Congratulations Kosmaj Just what a huge prime and so close to being aesthetically pleasing! Huge congrats. I have taken 15 to 620K now, with no further primes. Regards Robert Smith
 2005-03-29, 22:02 #321 Templus     Jun 2004 2·53 Posts releasing k=65 I am releasing k=65, it's done until n=310k. I have sieved until 158G. If anyone is interested in the sieve-file , just let me know!
 2005-04-26, 09:27 #322 Templus     Jun 2004 2·53 Posts Well...I'm reserving k=65 again!! It's quite a heavy one though!
 2005-05-26, 16:54 #323 Templus     Jun 2004 11010102 Posts update on k=65 k=65 has been completed until n=365000, but no new primes found It has been sieved until 200G and there are about 30000 tests left Continuing on this k!
 2005-05-26, 18:42 #324 Kosmaj     Nov 2003 2×1,811 Posts Templus I suggest you sieve more, at least to 500G, or if you can to 1T. Especially if you plan to continue to n=500k. If you test on two machines, stop LLR on one and run NewPGen for a week. BTW, many k's produced one or more primes in the n=350-400k range and I hope k=65 will follow the pattern! Good luck.
 2005-06-14, 09:46 #325 Templus     Jun 2004 2·53 Posts update on k=65 k=65 has been tested until n=380000, sieved until 400G (still sieving), and no new primes found. About 29000 k's to test until n=1M.
 2005-06-15, 15:16 #326 Kosmaj     Nov 2003 2·1,811 Posts Recent Progress k=55 checked to n=520k, no new primes, stopped and released. k=165, primes for n=221667, 236051, 246426, and 325922 checked to n=350k, in progress. And finally, after almost half a year, next prime for k=77: 77*2^855770-1 is prime (257615 digits) k=77 checked to n=857k, in progress.
 2005-06-29, 21:39 #327 Templus     Jun 2004 2×53 Posts k=65 update and new reservation k=65 has been tested until n=395000, sieved until 500G and no primes found. I am also reserving k=149 to test until ...? Let's hope I'll find a prime for this one! :-) The top5000 says that this k has primes for n=212460, which isn't listed on the progress site Last fiddled with by Templus on 2005-06-29 at 21:42
 2005-07-02, 14:37 #328 Kosmaj     Nov 2003 2·1,811 Posts Templus, 149*2^212460-1 was found by L70, Mr. Yamada, who doesn't report either to us or to Dr. Keller. [In February, together with two other persons he found a huge Proth prime 7*2^1491852+1 with almost 450,000 digits!] So we don't know what n's he checked. I don't think he went far beyond n=230k but he definitely has resources to go much further. I'll try to contact him and I ask him. I don't have his e-mail address but I know a person who does. But k=149 has low weight and to n=212460 only 12 primes have been found. Of course the next prime can be very close but more likely it's in the 400-600k (?) range. If you want to find some primes faster I suggest k=93 or k=99, both checked only to 210k, with higher weights and many primes already found. In any case, good luck! Last fiddled with by Kosmaj on 2005-07-02 at 14:39
 2005-07-02, 15:16 #329 Templus     Jun 2004 11010102 Posts Well...in that case I'll go check k=93 Thanks for your input! :)
 2005-08-11, 10:46 #330 Templus     Jun 2004 11010102 Posts update on k=65 and k=93 Hi all, k=65 has been checked until 418000, sieved until 550G (still sieving) and there are 27000 numbers left! Unfortunately, there are no new primes! I don't know what's wrong with this k, but when I find a prime, it will be quite a huge one! I saved all the RES64 numbers, so it can be double-checked later if needed. k=93 has been checked until 250000, sieved until 70G. I am working on it.

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