20071216, 10:46  #1 
May 2007
Kansas; USA
7^{2}×211 Posts 
Sieved files/sieving coordination
This thread is to coordinate any sieving efforts at Conjectures 'R Us and to post your sieved files that were not searched or were not fully searched for any reason. There will also be team sieving and search efforts and sieved files can be posted here that can be split up and searched by a group of us at the higher search ranges.
There are 2 remaining fullysieved files as follows: n=62K100K for Riesel base 13; 1 k left to prove conjecture. n=76.5K100K for Sierp base 17; 3 k's left to prove conjecture. The 100K limit is high enough for a top5000 prime and you could score extra points for finding the last prime or nexttolast prime that proves a conjecture! Edit: Remaining sieved files are now on the Reservations web pages. The attachment to this message can be ignored. I cannot delete an attachment nor edit it in place without deleting the entire post. If you'd like to test one of the above, please get them from the Reservations pages. Edit by Max: Actually, you can delete attachments, you just have to use "Go Advanced" to see all options. I've removed the attachment, which by now (8/30/09) is even more out of date than it was as of Gary's edit. Gary Last fiddled with by mdettweiler on 20090830 at 19:21 Reason: Updated to include info. about sieved files on web pages 
20071221, 22:05  #2 
May 2007
Kansas; USA
7^{2}×211 Posts 
Sieving started on team drive
I have just started sieving for team drive #1 on Sierp. base 16. I decided to go ahead and sieve all 57 k's remaining from n=25K200K. I realize that some are reserved to n=100K so I'm removing the portion of those k's below that limit.
If anyone wants to help with sieving, let me know. As a wild guess for this large of a range and # of k's, we'll need to sieve to ~P=6T. If the people who have their k's reserved to n=100K want to go higher or if anyone wants to reserve a new k starting from n=25K, then that's fine. Let me know and I'll forward you the portion of the big sieved file that you need. If anyone has an opinion on k's to leave available outside of the team drive for individual searching, let me know. Right now, I'm thinking we'll probably leave about 810 k's available but sieved files will be available on all of them. Gary 
20071221, 22:53  #3  
A Sunny Moo
Aug 2007
USA (GMT5)
3×2,083 Posts 
Quote:
FYI: If I reach n=100k on my two k's without finding a prime, I'll release them, so you can go ahead include them in a drive from n=100k on. 

20071221, 23:44  #4  
May 2007
Kansas; USA
7^{2}·211 Posts 
Quote:
The issue of wasted sieving effort affects all conjecture projects. There's no way around it while still maintaining efficient sieving. If you sieve n=25K100K and find a prime at n=25001, then the sieving effort is technically wasted if you don't use it. That said, if we're in top5000 territory, let's say someone is sieving n=100K200K and they find a prime at n=100001 base 16, then I'd encourage them to continue if what they're after is top5000 primes, even though it doesn't contribute to this effort. (And if we become an official primesearch project, any top5000 primes DO add to our score at Prof. Keller's site and I'm all for that!) But if people want to work on proving the conjecture then they can stop and go on to the next k. This technically makes the mathematical case for stopping sieving before sieving is removing n's as fast as LLR searches them but calculating that would become very complex quickly. I've been sieving until it is removing them as fast as they LLR but I would guess optimum in an effort like this is closer to 8090% as fast. Also, you reserved the k's. There's no problem with you taking them above n=100K yourself and just getting that portion of the big sieved file from me or whomever is helping with sieving. By the time you get to n=100K, it's likely we'd be close to having sieved them far enough. This sieve is intended for both personal use by anyone who wants it and for a team drive, which will benefit everyone as a whole. For that matter, if a majority of people are against a team drive, then I'll just post the big sieved file and people can reserve k's individually and search them using the applicable portion of the file. Flexibility with everyone's resources and tastes is the key in this and any primesearching effort. Gary Last fiddled with by gd_barnes on 20071221 at 23:51 

20071222, 05:28  #5  
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
Quote:
As for my reserved k's: I know I could continue to search them higher, but I'm thinking that once I reach n=100k, I may as well just crunch for the team driveso, when I reach n=100k (assuming that I don't find any primes, which would of course change the dynamics of the situation entirely), I'll release the two k's and instead work on the team drive. My crunching power is limited, so in some ways team drives are better for me than reserving individual k's. 

20071224, 04:05  #6 
May 2007
Kansas; USA
7^{2}×211 Posts 
Sieving will reach P=200G on all 56 remaining k's for Sierp base 16 to n=200K on two cores by early Monday morning (CST US). I just now deleted the sequence for k=7773, which tcadigan found a prime on.
Feel free to still reserve any k for individual work and I'll be glad to provide you with that portion of my big sieve. Tcadigan, if you haven't already sieved that far on your newly reserved k=6663 and want a file sieved to P=200G for n=25K200K, let me know. Gary 
20071226, 17:38  #7 
May 2007
Kansas; USA
7^{2}×211 Posts 
Sierp base 16 sieving to reach P=400G tonight
Sieving will reach P=400G on all 55 remaining k's for Sierp base 16 to n=200K on two cores by late Wed. night (CST US).
Sometime on Thursday, I will separate the reservations page into two pages, one each for Riesel and Sierpinksi, and post a separate sieved file for each Sierp Base 16 k as well as available sieved files for other bases. People are welcome to reserve any k for individual testing. I will be posting the entire range of n=25K200K in the sieved files but I would only suggest testing them to n=100K for now. If that is reached without finding a prime, it would be more efficient to wait until sieving has progressed further before continuing. I've lowered what I think to be the optimum sieve limit now to P=2T. Once that is reached, we'll start a team drive of most of the remaining unreserved k's; leaving a few for individual efforts. Gary 
20071226, 18:27  #8 
May 2007
Kansas; USA
24143_{8} Posts 
Sierp base 4 file available
Tcadigan has kindly posted his fullysieved file for 64494*4^n+1 for n=885.4K1M. It is attached below. Let me know if you are interested in searching it and I'll show it as reserved.
Note that this is part of the Sierp Base 4 project in this thread that we are helping coordinate. If you find a prime on it, please report it under that project when creating a prover code on the top5000 site. Gary Edit by Max (8/30/09): cleaned up nowunnecessary attachment Last fiddled with by mdettweiler on 20090830 at 19:24 
20071226, 19:04  #9  
A Sunny Moo
Aug 2007
USA (GMT5)
1100001101001_{2} Posts 
Quote:
Let me know what you think! Last fiddled with by mdettweiler on 20071226 at 19:06 

20071226, 21:02  #10  
May 2007
Kansas; USA
7^{2}×211 Posts 
Quote:
But before embarking on it, I'd like to give it about a week for others to pick it up individually first. Additionally, since this is Sierp Base 4, which has it's own project that we are helping coordinate, I'd like to get Jean Penne's OK on it. He is searching all of the other k's for that project currently as well as the Riesel Base 4 k's for this effort. Jean, do you have the resources to add the above attached sieved file to your testing for Sierp base 4? If not, are you OK with us using an LLRNet server for testing? One question, Anon, for both this and for our project's future use: If we use an LLRNet server, will the Sierp Base 4 project still get full credit? I'm thinking that the originator of that project would not be in favor of using an LLRNet server if the credit for a huge prime find had to be shared. Since 'Conjectures 'R Us' is not yet a recognized project on the top5000 site, it wouldn't matter if it was our effort at this point but it could matter in the future. Thanks, Gary 

20071226, 22:06  #11  
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
Gary, I've split your post into mulitple parts so I can respond to them individually.
Quote:
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