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Old 2005-02-15, 20:36   #12
lsoule
 
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For comparison, I've sieved 515106735 for k=460k-1M
up to 2.5T and still have 78,000 candidates.

-Larry
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Old 2005-02-16, 07:11   #13
ValerieVonck
 
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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!
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Old 2005-02-17, 07:56   #14
Kosmaj
 
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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
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Old 2005-02-17, 17:06   #15
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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
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Old 2005-02-17, 19:04   #16
lsoule
 
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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.
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Old 2005-02-17, 20:46   #17
ValerieVonck
 
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Isoule,

What is your sieving speed?

Mine is P4 3 Ghz: 648 k
P4 2.4Ghz: 484 k
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Old 2005-02-18, 00:48   #18
lsoule
 
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For k=231, it looks like 629k/s on a P4 2.2GHz
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Old 2005-02-18, 07:18   #19
ValerieVonck
 
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OK thank you.
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Old 2005-02-20, 11:30   #20
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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
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Old 2005-02-21, 17:05   #21
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Range 230K => 240K done. No primes found
Range 240K => 250K currently testing - 674 candidates
Continuing sieving with lower bound 250k.
95886 candidates remaining
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Old 2005-02-23, 16:52   #22
ValerieVonck
 
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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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