20060511, 17:58  #430 
May 2005
658_{16} Posts 
k=25 status
k=25 tested till n=700000.
I'm still working on it 
20060511, 20:38  #431 
"Curtis"
Feb 2005
Riverside, CA
4,673 Posts 
Reserving k=197 and k=201. We'll test from 250k to 500k.
k=127 is complete to 575k, sieved to n=1 million (p=800B). k=99 is complete to 260k, sieve at 1.9 trillion and counting. k=103 is sieved to 875B (up to n=500k), starting LLR now. Curtis 
20060531, 18:16  #432 
Nov 2004
California
2^{3}·3·71 Posts 
End of the month status update and reservation
End of the month status update:
K current N 39 580k 69 735k 195 572k 231 858k Also, I'd like to reserve k=223 again and take it a little further past n=1M 
20060603, 15:38  #433 
Nov 2003
7046_{8} Posts 
20 K's for the 4th Drive
We are about to start sieving the following 20 K's:
203, 205, 209, 211, 215, 217, 241, 245, 257, 259, 263, 265, 271, 275, 281, 283, 287, 293, 295, and 299 for the 4th Drive. We'll sieve in the n=100600k range so that people who wish so can fill the holes on Keller's list. According to our stats and Prime Search's page (currently their web page is not online) all above K's have been checked to 230k, some to 250 and 260k and we'll concentrate our LLR efforts from respectively achieved limits. The only prime found beyond the reported limit is 245*2^2384681 found by L118 in November 2005 (k=245 reportedly checked to 230k). Individual prime hunters for k*2^n1, k<300 are directed to k's divisible by 3, k's less than 100 (specially for large exponents), and other available k's. I was thinking to also include k=91, 109, 139 and 173 but I didn't because k=91 has been tested to 300k, k=109 to 350k, and k=139 to 400k while k=173 is apperently beind tested by L99. The first 3 are available for individual prime hunters too. Please let me know if anybody has any objections/proposals regarding these 20 k's. Last fiddled with by Kosmaj on 20060603 at 15:51 
20060603, 22:41  #434 
Apprentice Crank
Mar 2006
2·227 Posts 
Update:
k=19 has been searched to n=660,000. Other than the prime reported in the "primes found" thread two weeks ago (for n=645,555), there are no other primes in this range. I'll continue with this k, and the residues are attached below. 
20060605, 16:50  #435 
Jun 2004
2×53 Posts 
k=93
k=93 has been completed until n=400k, still in progress

20060605, 20:42  #436  
Oct 2003
Croatia
2^{3}·3·19 Posts 
Quote:
http://www.myjavaserver.com/~primesearch/ 

20060606, 08:45  #437 
Mar 2006
Germany
13^{2}×17 Posts 
Status on k=209
i've reserved k=209 on prime search up to n=420.000.
current n is 382.000 and no prime found yet. 
20060606, 12:30  #438 
Feb 2003
2^{2}·3^{2}·53 Posts 
k=155
k=155 has reached n=900k. But no primes found since n=500k.
I'm continuing to n=1M... 
20060608, 01:56  #439 
Nov 2003
2×1,811 Posts 
Thanks to everybody who replied. We have removed k=209 from our list, leaving it to Karsten. We added k=91 and k=109, so there are going to be 21 K's this time. Sieving is already under way. Our stats page is updated but the 21 K's are not marked yet.

20060610, 21:11  #440 
"Robert Gerbicz"
Oct 2005
Hungary
2·7·103 Posts 
Hi all!
Are you using newpgen for sieving? Because it doesn't observe algebraic factors, as I can see! So if k is a power of a number: k=a^d ( here a>1 and d>1 ) and n is divisible by d so n=s*d, then k*2^n1 is composite, because it is divisible by a*2^s1. In some cases it is a real improvement, but not very much, because in these cases you have got a very high chance that k*2^n1 has got a "small" prime divisor, so newpgen will find it very quickly. Note that for some k, this is a zero improvement, for example if k=49 then 49*2^(2*s)1 is divisible by 3, so all algebraic numbers are eliminated. For k=125=5^3 all 125*2^(5*s)1 are divisible by 31. As I can see: up to 300 the suitable ( odd ) k values for real improvement: k=9, k=27, k=81, k=225, k=243 Last fiddled with by R. Gerbicz on 20060610 at 21:19 
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