20080117, 23:13  #177  
May 2007
Kansas; USA
10,357 Posts 
Quote:
Agreed on the range to sieve. The speed varies by the square root of the nrange so n=100K500K should sieve about 50% slower [11/sqrt(100K/400K)] than n=100K200K. If you don't want that kind of slowdown, you could do n=100K300K, which should sieve about 29% slower [11/sqrt(100K/200K)]. The main thing here is that on these lowweight k's, the chance of finding a prime in any n=2X range, i.e. n=100K200K, is well under 50% so the bigger range is better. Clearly you'll want to break off pieces of the range and LLR them as you go while continuing to sieve the higher ranges. About how to sieve: For 2 k's, you would generally use 2 instances of sr1sieve. But for 3 to ~50100 k's, use sr2sieve on all of them. >~50100 k's use srsieve for all sieving. There may be exception situations on 2 or 3 k's since that's kind of the dividing line on what to use. But sr1sieve running 1 k would have to be 3X as fast as sr2sieve running 3 k's, which seems unlikely in most situations. You might test it out to be sure and post back here what you find out. Gary 

20080118, 00:43  #178  
"Jason Goatcher"
Mar 2005
3507_{10} Posts 
Quote:
I've removed factors in the past using srsieve, it's simply a matter of carefully reading the instructions. :) 

20080118, 01:08  #179  
"Jason Goatcher"
Mar 2005
3×7×167 Posts 
Quote:
As Dr. Silverman would say: "Trust, but verify."(This applies to my assertion about PRPs, as well as the PRP itself) Last fiddled with by jasong on 20080118 at 01:09 

20080118, 06:25  #180 
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
Riesel Base 30 k=25 sieving status: Currently at about 340G, planning to go to 600G. Should be done sometime next week (hopefully). It's running on an older machine that isn't on all the time.

20080118, 22:52  #181 
May 2007
Kansas; USA
10100001110101_{2} Posts 
Sierp base 16 singlek reservations...
Reserving Riesel base 16 k=2297, 2993, and 13854. I'll take them up to n=100K. If I find one for k=13854, that'll knock out the same k on base 4.
If someone reserves Riesel base 4 k=13854, please let me know and we'll coordinate. My LLRing for base 16 to n=100K will have the effect of testing all of the even n's for base 4 up to n=200K. In this situation, I would usually suggest reserving and testing base 4 to n=200K to accomplish finishing both of them more easily but I figure I'll do it this way and knock both of them out if I find a prime. Gary 
20080119, 06:24  #182 
A Sunny Moo
Aug 2007
USA (GMT5)
6249_{10} Posts 
My 2nd Drive file will probably be done sometime tomorrow, so when that's done, I've decided I'll try some sieving for a change. I've decided to reserve the following Sierpinski Base 6 k's for sieving:
154797*6^n+1 157473*6^n+1 166753*6^n+1 168610*6^n+1 172257*6^n+1 I'm reserving all five of them for sieving in the range 30K<n<100K. After sieving I'll donate most, possibly all, of the sieved files for public consumption. (I'm considering keeping one or two of them for myself.) Edit: Forgot to mention, I plan to sieve these up to p=600G. Last fiddled with by mdettweiler on 20080119 at 06:37 
20080119, 15:13  #183  
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
Quote:


20080119, 16:28  #184 
Sep 2004
UVic
2×5×7 Posts 
reservation complete
no primes found.
attached is results file. reserving sieverieselbase13.txt 
20080119, 19:28  #185 
Jan 2005
479 Posts 
Two small successes for Sierpinski 24:
20161*24^16932+1 is prime 26801*24^17390+1 is prime Including the MOB that leaves 168 sequences to eliminate (no prime upto 34.3K) I've now included the MOB into the main files. 
20080119, 20:28  #186 
Sep 2006
10111011_{2} Posts 
Ok people, I made some performance tests for sieving sierpbase 17.
The software I used: Windows XP Pro 32 bit srsieve 0.6.10 sr1sieve 1.2.6 sr2sieve 1.6.18 hardware: Intel C2D E6600 @2.4 GHz results: First, I used srsieve to create a sieve file and sieve it till p=1G. nrange = 100,000  1,000,000 srsieve started with ~800 kp/s. At the end, it got ~930 kp/s Then I used srfile to convert this sieve file to ABCD format (for use with sr2sieve) and three NewPGen files (for use with sr1sieve) sr1sieve (single k): the speed varied between 6.8 Mp/s and 7.5 Mp/s sr2sieve (all three k together): speed between 2.7 MP/s and 3.2 MP/s I think, it varies so much, because it was refreshed for every factor found (almost every second), but I can say, that sieving all three k together is faster, than every k alone. 
20080119, 20:34  #187 
Sep 2004
2830_{10} Posts 
Now try sr2sieve 1.7.5 version....

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