20080724, 15:36  #1 
Sep 2004
2×5×283 Posts 
Search for k's at n>1M
Gary,
Do you have sieved files from k's beyond 1M? Just curiosity. Carlos 
20080724, 16:54  #2  
May 2007
Kansas; USA
26441_{8} Posts 
Quote:
No. Bruce is currently sieving 600K1M for k=4001001. That's as close as we get. If you are interested in something similar to RPS's 6th drive with several k's at once searched for n>600K, we can work something out on the individualk drive for the remaining unreserved k's. Gary 

20081124, 11:44  #3 
Sep 2004
2830_{10} Posts 
Let's organize a search beyond 1M for one k. Let's find a 1,000,000 digit prime, shall we? I propose a lower weight k.

20081124, 17:38  #4 
Just call me Henry
"David"
Sep 2007
Liverpool (GMT/BST)
7·859 Posts 

20081124, 20:07  #5 
Sep 2004
2·5·283 Posts 

20081124, 20:11  #6 
Just call me Henry
"David"
Sep 2007
Liverpool (GMT/BST)
7×859 Posts 

20081124, 20:17  #7 
Sep 2004
101100001110_{2} Posts 
The goal of NPLB project is to take 300 < k < 1001 tested up to n = 1000000 until the end of 2012.
But you can pick one k and take it beyond 1M. We already have a member doing it but I was thinking in making a group effort with sieving and LLRing. Carlos 
20081124, 20:44  #8 
I quite division it
"Chris"
Feb 2005
England
31×67 Posts 
Maybe sieve a bunch of specific ks?

20081125, 23:40  #9 
May 2007
Kansas; USA
2D21_{16} Posts 
Although I'd prefer to not make a specific drive out of it, doing a coordinated sieving effort for and then searching k's for n>1M is fine.
If you're going to do lowweights, I would suggest picking them from the k=300400 range. Another thought is to pick some extreme low weights for k>1001. I'm just about done with a "side effort" to find primes for k's that show zero primes on the rieselprime.org pages for k=600K1.4M. I'm searching them to n=100K and if no prime found taking them to n=300K. I did a large majority of it way back but am finishing it up now. With this go around, I've searched 17 low weight k's that have no primes shown there and have found just one k remaining that has no prime up to n=300K. Previously I searched a whole bunch of them (don't remember the #) for k=600K1M up to n=300K, and found 9 k's with no primes. For everyone's reference, here are 10 k's for k=600K1.4M with no primes up to n=300K: 612509 671413 685183 686711 700057 780427 844559 963643 981493 1049917* *The last one was supposedly searched by someone else already to n=1M but I've learned not to trust these ranges. I've found primes on many of them that had been shown as searched to limits higher than the primes that I found. In the next day or two, I'll be reporting all the primes that I found for the effort and after Karsten gets the site updated, the above k's should be the only ones remaining shown on the site for k=600K1.4M with no primes to n=300K. Whether it be for k=300400 (preferred) or for k=600K1.4M, this provides some food for thought if you guys want to coordinate some sieving on lowweight k's. All except 2 of the 10 k's that I showed above have weights < 100. One thing about the larger k's is that they will take longer to test, which will be quite significant at n>1M so lower k's would certainly be preferrable. One final suggestion: Try a HEAVYweight for a k=300400 that has already been completed to n=1M or that is ABOUT to become completed. (My k=309 would be a decent choice.) I mention heavyweight because you could get a lot of tests in at the lower n>1M ranges. Searching, perhaps, 500010000 candidates in the n=1M1.2M range gives a much better chance at prime than the same # of searches for n=1M2M. Gary Last fiddled with by gd_barnes on 20081125 at 23:49 
20081125, 23:48  #10 
May 2007
Kansas; USA
10110100100001_{2} Posts 
See http://www.mersenneforum.org/showthread.php?t=10618 #2 is done. #4 has been opened up already. It's pretty much set in stone that we'll do k=4001001 for n=600K1M in 3 separate drives of k=400600, 600800, & 8001001 as people seemed to like that idea. As always, I'm open to suggestions though. k=10052000 for n=50K500K hasn't been fully decided yet. I know we'll search all of the k's in tandem at the lower nranges as we continue to sieve. At n=50K, the ranges will fly even with ~500 k's. I'm thinking we'll open up the top5000 range for n=350K500K after we have sieved far enough but this entire effort is still open to team discussion on how to progress with it. One reason that I'm not specifically promoting n>1M searches is that the above is a huge amount of work already. But I realize that people have different tolerances for what they like to search so it's fine if you guys want to take up a coordinated effort for them. Gary Last fiddled with by gd_barnes on 20081125 at 23:51 
20081126, 07:34  #11 
Just call me Henry
"David"
Sep 2007
Liverpool (GMT/BST)
13575_{8} Posts 
one thing i would say dont chose k<300 as RPS will go berserk

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