20130827, 08:43  #144 
"Lennart"
Jun 2007
2^{5}·5·7 Posts 
At the rate at which primes have been added to this list in the past, the 307855 digit prime "2217*2^10226601" may only be on the list for about 4 weeks.
2217*2^10226601 is Prime Lennart 
20130827, 10:40  #145 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
3×1,571 Posts 

20130827, 11:45  #146 
"Lennart"
Jun 2007
2^{5}×5×7 Posts 
I think it is best to leave this range or cut it down to 2000<k<2100.
I have 100 core on it now and it will keep it on the list now, but we need at least 200 core to make any progress ( to get higher on the list). What do you think ? Lennart 
20130827, 11:49  #147 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
3·1,571 Posts 
I think this drive should be shut down. Leave the numbers to NPLB. Let's concentrate on k's<300.
Carlos 
20130827, 12:24  #148 
Feb 2003
3×5×127 Posts 
A cut down to a smaller number of k might be a good option (instead of abandoning the whole drive). But maybe 2000<k<2100 is still too large. We could also consider to pick just the high weights, or (alternatively) the k's which had been primeless so far.

20130827, 12:38  #149 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
3·1,571 Posts 
Let's look at our Top 5000 primes. The first prime with k 2xxx appears in position 184, the second in position 2110, and so on, so we are wasting time with this drive.

20130827, 13:07  #150  
Feb 2003
3·5·127 Posts 
Quote:
Of course, we currently have quite a few drives  maybe just too many. If we are about to abandon any, the 11th drive would be the first to consider. But as long as there is interest in this drive, we should keep it alive, but without jeopardizing the other drives by drawing too much computing power... (There might also be individuals who don't care about their Top5000 score and who crunch "their" numbers just for fun.) Regarding a cut down to a smaller number of k's: I checked the 7th drive (which covers the range k=20003000). The average Nash weight is 2901, with individual weights ranging from 1659 (k=2265) to 3883 (k=2835). In comparison, the 11th drive contains quite a few k's with even larger weights. Here are the largest ones with weight>3000: Code:
k weight  2289 3107 2061 3124 2271 3180 2079 3221 2085 3345 2127 3437 2259 3437 2253 3507 2205 3532 2103 3935 2043 4049 2211 4509 

20130827, 13:27  #151 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
11151_{8} Posts 

20130827, 14:39  #152 
Dec 2002
1BC_{16} Posts 
I was planning on alternating between the 8th and 11th drives to help advance both drives.
My thinking is we only needed to get both drives to n=1.20M to stay ahead of PrimeGrid's Proth search which is producing many more primes than their SG search. Proth is the one we need to worry about. The SG search could go on for years and will never increase in digits so we can catch up and pass at some point down the road. The 8th drive once ahead of the proth search can be easily be maintained with just a few machines active. Pulling ahead should only take a couple of weeks at current rate. The 11th drive is a bit more problematic due to the number k's involved. Per Lennart's post with his 100 cores engaged it will be a long slog to reach our goal of overtaking the proth search. I could bring 50+ cores to the effort, more once the summer is over, but when Lennart's and my interest wains we would be stuck losing ground again. So, I would vote to cut the number of k's to a more manageable level, but what that level should be? 
20130827, 14:57  #153  
Feb 2003
3×5×127 Posts 
Quote:
Picking the range k=20002100 would be roughly 33%. Quite comparable... I would vote for one of those options. BTW.: I could also bring a few cores (about 20) into this effort. Last fiddled with by Thomas11 on 20130827 at 15:00 

20130827, 23:09  #154 
"Lennart"
Jun 2007
2^{5}·5·7 Posts 
10211025k complete 2 Primes
2171*2^10230341 is Prime Lennart 
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