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 2008-02-07, 17:25 #221 gd_barnes     May 2007 Kansas; USA 1113610 Posts Reserving Sierp base 6 k=10107, 13215, and 14505. I'll take them up to about n=60K or until I find primes or get tired of them. I may combine them in with team drive 3 after hitting n=60K. Gary
 2008-02-07, 22:29 #222 Siemelink     Jan 2006 Hungary 1000011002 Posts Confirmed by pfgw: 4001*28^56146-1 is a probable prime. Time: 1318.830 sec. Please credit George Woltman's PRP for this result! Tralala, Willem.
 2008-02-08, 20:35 #223 gd_barnes     May 2007 Kansas; USA 2B8016 Posts Sierp base 12 k=404 is complete to n=100K. No primes. Now unreserved. Sierp base 6 k=10107, 13215, and 14505 are complete to n=60K. No primes. Now unreserved. Sieved file links up to n=100K are on the reservations web page. Gary
 2008-02-10, 01:02 #224 rogue     "Mark" Apr 2003 Between here and the 11010000110102 Posts I'm reserving the remaining base 30 Riesel values for 25k < n < 100k 659 (25K) 774 (25K) 1024 (25K) 1580 (25K) 1642 (25K) 1873 (25K) 1936 (25K) 2293 (25K) 2538 (25K) 2916 (25K) 3253 (25K) 3256 (25K) 3719 (25K) 4372 (25K) 4897 (25K)
2008-02-10, 04:47   #225
gd_barnes

May 2007
Kansas; USA

101011100000002 Posts

Quote:
 Originally Posted by rogue I'm reserving the remaining base 30 Riesel values for 25k < n < 100k

Great! Welcome to the effort Rogue.

Gary

 2008-02-16, 17:24 #226 michaf     Jan 2005 479 Posts After a draft of 10k n’s without primes, there are two in a row: 83988*31^41706-1 is prime 111038*31^42197-1 is prime Jippee That leaves 11 candidates on Riesel 31 (26064 candidates to test upto 100k)
 2008-02-17, 12:23 #227 grobie     Sep 2005 Raleigh, North Carolina 337 Posts Riesel base 30 k=225, 239, 249 only testing to n=50k forgot to say how far I was going when I reserved these. Last fiddled with by gd_barnes on 2010-05-11 at 05:12 Reason: remove base > 32
 2008-02-20, 00:19 #228 grobie     Sep 2005 Raleigh, North Carolina 33710 Posts Riesel Base 30 k=225, 239, 249 tested to n=50k No Primes found, releasing these. Results e-mailed, let me know if you got them.
 2008-02-21, 01:31 #229 VBCurtis     "Curtis" Feb 2005 Riverside, CA 10101000011002 Posts base 16 k=443 complete to 550k base 2 (~135k base 16). LLR in progress 550-650k and 650k-up. I have sieved to 1.2M fully, and started a sieve from 1.2M to 3M (750k base 16). I *will* defeat this k. 5076 base 28 finally in progress, should be complete tomorrow sometime to 25k, no further reservations. Apologies for the delay. -Curtis
2008-02-21, 05:19   #230
gd_barnes

May 2007
Kansas; USA

256008 Posts

Quote:
 Originally Posted by VBCurtis base 16 k=443 complete to 550k base 2 (~135k base 16). LLR in progress 550-650k and 650k-up. I have sieved to 1.2M fully, and started a sieve from 1.2M to 3M (750k base 16). I *will* defeat this k. 5076 base 28 finally in progress, should be complete tomorrow sometime to 25k, no further reservations. Apologies for the delay. -Curtis
Thanks for the update Curtis. Interestingly a multiple of k=443, that is k=7088, is one of 51 k's remaining for Riesel base 256 (all remaining searched to at least n=20K, i.e. n=160K base 2).

If you can find a prime for k=443 where n==(4 mod 8), that eliminates the equivalent of k=443 in 3 different bases at once. Good luck with THAT!

Gary

 2008-02-23, 13:48 #231 Siemelink     Jan 2006 Hungary 22×67 Posts Status update Hi everyone, First of all: Thank you Gary for tracking all this! Your webpage make this obscure corner of the prime world easy to track. I've finished some of my range, alas without primes: 233*28^n-1 100000 1422*28^n-1 100000 1611*22^n+1 200000 588*30^n+1 100000 278*30^n+1 100000 I still have (32 || 65 || 155) *26^n+1, it is at 95219 now. It stalled because other people keep using that PC. Maybe this week I'll clean up. My project on k*19^n-1: With PFGW I found ca 5000 k's remaining after taking n until 2000. With srsieve and LLR I've taken these to n = 5700. I now have 2200 k's remaining. Currently I am planning to take them to 25k. That's going to take two months or more. Having fun, Willem.

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