[quote=Flatlander;193426]
I think from now on, when I start a sieve file, I will sieve a large range to some lowish P. Then decide how far I wish to test and snap that off for further sieving. This will give me optimum sieving and leave a 'starter file' for the next guy. There is a file-famine imho.
[/quote]

One thing to keep in mind: Tremendous efficiency is gained by sieving n=200K-1M (or 200K-500K) vs. n=200K-300K. Increasing n-range in a sieve file is much more efficient than adding more k's to it. Notice that one file here is 8 times as large as the other but it should only take you sqrt(8) = ~ 2.8 times as long to sieve to the same depth. For that reason, I encourage people to sieve at least twice the n-range as they plan on testing and sieve the entire file to the optimum depth using the aforementioned calculations for the range only that will be tested by the initial person doing the sieving. That will help offset greatly the added time needed to sieve for the next guy but still sieve the entire file to the same depth.

I'd discourage what you are suggesting. You just have to be patient and wait on it for a longer-term gain. It would be quite inefficient to, say, sieve n=200K-500K to P=1T, pull out n=300K-500K, and then sieve n=200K-300K to some higher depth. I'd like to avoid that if possible. Adding n-range to the sieve doesn't take much extra time compared to what is gained in the long run.

As for a file famine, Ian had alluded to me a long time back that we needed to do some sort of project-wide sieveing effort for many bases. This is a good idea but it still couldn't be done any more than one base at a time, although the two sides can be combined for many of the bases. I didn't run with the idea because it would take a lot of time on mine and Max's part to coordinate numerous such sieving efforts. So for now, people have to pretty much sieve their own files with the exception of those posted on the pages.

On a related topic: As I suggested to Ian on the many bases > 32 that he is doing, it's best if you can sieve both sides at once if the # of k's remaining and the current n-range is somewhat similar. In your case, that wasn't really feasible because someone else already had Sierp base 23.

Later this week, I'll see if I can bring together some of this sieving info. into its own thread. Even if it's an artform, at least people will have a general starting point about how to approach it.


Gary

[quote=gd_barnes;193454]Everyone, I'm going to ask that we "save" Riesel base 23 for Max until after he gets back on Thursday to see if he would like to continue it. He was kind of wanting to do a base <= 32 with 1 k remaining before he left but a couple of us beat him to the punch just a few days before he was going to take one. Since Chris found a prime for it, it convieniently leaves R23 with one k remaining. If Max doesn't want it within a couple of days of getting back, then it will be open to anyone.[/quote]
Nah, don't worry about it. If someone else who can get started on something sooner can grab a reservation (of any kind, not just in this case) before I can, more power to him. Usually if I am sure I'm planning to do something and would like to "claim" it, I'll just reserve it and leave no ambiguity. :smile:

BTW, congrats Chris and Ian on your respective base 23 primes! In this particular case, now that Riesel base 23 is down to one k remaining, Gary is correct, I would like to work on it later on, but please, don't let that stop anyone else if they can do it with reasonable alacrity. After all, the whole point of doing these is to get the conjectures proven as quickly as possible, regardless of who does the work. :smile:

sierp-b17: one k remaining, n ~ 415K
sierp-b19: 1112 k remaining, n ~ 26k
:smile:

Edit: At the moment, I am sieving sierp-b19 till n=100k.
But I don't think, I will finish there..

Attached are my results for my base 22 reservation.

Taking R base 30 from 100k to ? (All ks.)

Sierp base 31 is at n=20K. Continuing on to n=25K.

38 primes found for n=18K-19K.
44 primes found for n=19K-20K.

1277 k's remain.

A nice run of primes for n=19K-20K gives me hope that I'll still get to < 1100 k's remaining by n=25K.

Sierp. base 28 is complete to n=160K, no primes. Results are attached for 150K-160K; releasing. This is somewhat earlier than my original reservation had indicated that I'd release it, though now that Riesel base 23 is available, that's the much more obvious choice for my quad to work on.

Speaking of which, [b]reserving Riesel base 23 for n=226K+[/b]. :grin:

Riesel base 22 is at n=250K. Nothing to report. Continuing on to n=300K.

status report
 

Base 10 (Riesel + Sierpinski) checked till n=320000. I'm still working on it.

Riesel Base 27
 

Riesel Base 27 complete to n=400K

Nothing yet - continuing

Riesel base 23 is complete to n=300K, no primes. Results attached for 226K-300K; continuing.