20110831, 01:53  #1 
Nov 2003
2·1,811 Posts 
Any interest in yet another submegabit drive?
All our drives featuring n<1M are almost over.
Is there interest in one or more new submegabit drives? If so, what starting exponent do you prefer, n=700k or 800k or another one? As far as I'm concerned I prefer testing n>1M, but of course if we start a new drive I'll test a few files. 
20110831, 03:10  #2 
"Curtis"
Feb 2005
Riverside, CA
5,279 Posts 
I think we should continue any k from 8th or 9th drive that is below k=10000 into megabit range. I am not interested in new k's under 1M.
One new drive I would get behind (even if it starts below 1M) is adopting a contiguous range of k's below 10,000 to test together, like Peter has done with 10001300. I would suggest we use some of that range, but Peter is easily keeping up on those k's working alone! Curtis 
20110831, 08:42  #3 
Feb 2003
11110000000_{2} Posts 
I would also like the idea suggested by Curtis of testing a contiguous range of k from the k<10000 pool.
According to http://www.rieselprime.de/ all below k=4200 are taken by others (teams or individuals), so we might start from there. Perhaps, we could provide the test files for the submegabit ranges too (e.g. starting from n=700k), so that users with slower machines and/or new team members may pick from those files and others may start from n=1M. This would also give us the chance of finding some primes before they are getting too small for the Top5000 list... BTW.: There are also the high weight k's from the 7th drive, we could start with from n=1M. 
20110831, 09:09  #4 
Nov 2003
2^{3}×163 Posts 
I would be interested in something submegabit. A contiguous range would be a good idea and seems to be quite popular!

20110831, 17:39  #5 
"Dave"
Sep 2005
UK
101011011000_{2} Posts 
I am prepared to transfer k=40034199 to RPS if people are interested. I have searched it from n=500k800k and it is getting close to the point where the work involved will be greater than my available resources. There are about 2900 candidates per 1000n, so a bit less work than the 9th Drive. Note that k=4153 was searched to n=1M by Beyond before he knew that I had the range reserved. k=4001 could also be added from 1M.

20110901, 03:12  #6 
"Curtis"
Feb 2005
Riverside, CA
5,279 Posts 
I think amphoria's range is a mustdo; do we wish to extend the range above 4200? We could run 4003 up to 4300 or 4400 starting at 800k, and also start a subdrive to get 42014300 or 4400 'caught up' from top5000 cutoff to 800k.
My personal opinion is that the 9th drive is a bit big, so 40034199 sounds just right to adopt. If it goes quickly, we can start another one on 42014399 without much effort and this also has the nice effect of having drives available at multiple nranges like we've done for so long. So, how about a continuation of 7th and 8th drive k's at 1M, and also 40034199 at wherever it is now? Curtis 
20110901, 07:21  #7 
Nov 2003
2·1,811 Posts 
Okay, thanks for your replies.
Then, we'll start another submegabit drive very soon. Next, we have to decide on exponents and based on that on coefficients (k). I think n=700k is a bit too low. PrimeGrid guys reported 30 Proth primes at around n=690k yesterday and will reach 700k soon. Here are current, approximate ranks of some primes with "milestone" exponents on Top5000: n=700k ... 3150 n=750k ... 2500 n=800k ... 2050 Please suggest the starting n: 700k, 750k or 800k (or another one). k's between 4003 and 4199 are fine if we start at 800k. 
20110901, 12:15  #8 
Feb 2003
1920_{10} Posts 
Perhaps this helps for the decision about the starting point:
For k=40004200 the FFT length changes: at n=700k (48k > 56k) at n=814k (> 64k) at n=931k (> 72k) Regarding k=14002000 and 20003000, I'm not sure about NPLB's intentions. So far it seems that they are concentrating on the lower n ranges only, so that we may consider to take them too... 
20110901, 21:11  #9 
"Curtis"
Feb 2005
Riverside, CA
12237_{8} Posts 
I would like to start as low as possible, as I believe there's goodness in cataloging as many primes as we can find.
re: Thomas' idea, it's a tough spot. NPLB does not have the resources to test all of 14003000 even to keep up with 5000th place, but Gary is nothing if not territorial and rather unlikely to quietly cede any of that range. If I am wrong about his interests and they realize they can't do it all, I'd vote for 20002300 that way, we'd have 5300, 10011300 (peter), 20012300. Curtis 
20110901, 22:19  #10  
"Dave"
Sep 2005
UK
2^{3}×347 Posts 
Quote:
Last fiddled with by amphoria on 20110901 at 22:31 

20110902, 10:48  #11 
Nov 2003
2×1,811 Posts 
We'd definitely like to avoid troubles, but I just checked Top5000, and found that all Riesel primes with 2000 < k < 3000 posted since 2009 were reported by RPS members! Which means that nobody else is searching for them.
So, how about Ks in the 20002300 range, excluding already searched ones, starting at n=700k ? k = 2235, 2265, 2295 from our 7th Drive should be excluded as well. Dave, can you post the ones you already tested? Last fiddled with by Kosmaj on 20110902 at 10:51 
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