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 2005-02-15, 20:36 #12 lsoule     Nov 2004 California 32508 Posts For comparison, I've sieved 515106735 for k=460k-1M up to 2.5T and still have 78,000 candidates. -Larry
2005-02-16, 07:11   #13
ValerieVonck

Mar 2004
Belgium

11010011112 Posts

Quote:
 Originally Posted by lsoule For comparison, I've sieved 515106735 for k=460k-1M up to 2.5T and still have 78,000 candidates. -Larry
Ouch!

2005-02-17, 07:56   #14
Kosmaj

Nov 2003

1110001001102 Posts

Quote:
 Originally Posted by CedricVonck Currently resieving the range 231k => 1 Million.
What do you mean by "resieving" ? Sieving again against the same possible factors? Why?? I'm not aware that any publicly availabe siever (NewPGen, ksieve) is missing composites. If you found otherwise please provide examples.
Quote:
 This range spans approximately 101.000 tests. ... So hopefully with sieving this range to 1 T or more?? I'll get this range to about 50.000 (or less) potential candidates.
I don't know how deep have you sieved those 101,000 candidates but even if you sieved only to 1 bn you will soon realize that a reduction to 50,000 is impossible...

Another possibility is to stop tests early. Indeed, there is nothing special about this k. No need to marry the first love

2005-02-17, 17:06   #15
ValerieVonck

Mar 2004
Belgium

11010011112 Posts

Quote:
 Originally Posted by Kosmaj What do you mean by "resieving" ? Sieving again against the same possible factors? Why?? I'm not aware that any publicly availabe siever (NewPGen, ksieve) is missing composites. If you found otherwise please provide examples. I don't know how deep have you sieved those 101,000 candidates but even if you sieved only to 1 bn you will soon realize that a reduction to 50,000 is impossible... Another possibility is to stop tests early. Indeed, there is nothing special about this k. No need to marry the first love
LOL
With resieve I mean: I have put 2 ranges together, to be absolute sure.
I almost restart the sieve from scratch.

Other point, per day I am eliminating approx 1900 factors.
I'll keep this up until the find a factor rate will drop
I am currently dividing the workload between 2 machines.

The last point: I know that there are other K's to be searched but I really want to find some big primes.

Ps. down to 98000+ tests.
3000 factors eliminated.

Last fiddled with by ValerieVonck on 2005-02-17 at 17:14

 2005-02-17, 19:04 #16 lsoule     Nov 2004 California 23×3×71 Posts Sieving seems to be much more effective on my k=231. Sieving the range n=400k-1M only up to 137B leaves just 49,000 tests.
 2005-02-17, 20:46 #17 ValerieVonck     Mar 2004 Belgium 7·112 Posts Isoule, What is your sieving speed? Mine is P4 3 Ghz: 648 k P4 2.4Ghz: 484 k
 2005-02-18, 00:48 #18 lsoule     Nov 2004 California 32508 Posts For k=231, it looks like 629k/s on a P4 2.2GHz
 2005-02-18, 07:18 #19 ValerieVonck     Mar 2004 Belgium 7·112 Posts OK thank you.
 2005-02-20, 11:30 #20 ValerieVonck     Mar 2004 Belgium 11010011112 Posts Currently testing the range 231K => 240k : 576 candidates on my P4 3G. Continuing sieving the range 500G => 1T on my P4 2.4G. Last fiddled with by ValerieVonck on 2005-02-20 at 11:30
 2005-02-21, 17:05 #21 ValerieVonck     Mar 2004 Belgium 7×112 Posts Range 230K => 240K done. No primes found Range 240K => 250K currently testing - 674 candidates Continuing sieving with lower bound 250k. 95886 candidates remaining
 2005-02-23, 16:52 #22 ValerieVonck     Mar 2004 Belgium 84710 Posts Range 240K => 250K done. No primes found Range 250K => 280K currently testing - 1997 candidates Continuing sieving with lower n bound 280k.

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