K=13236795 Status Post - Page 2

lsoule · 2005-02-15, 20:36

For comparison, I've sieved 515106735 for k=460k-1M
up to 2.5T and still have 78,000 candidates.

-Larry

ValerieVonck · 2005-02-16, 07:11

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!

Kosmaj · 2005-02-17, 07:56

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

ValerieVonck · 2005-02-17, 17:06

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.

lsoule · 2005-02-17, 19:04

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.

ValerieVonck · 2005-02-17, 20:46

Isoule,

What is your sieving speed?

Mine is P4 3 Ghz: 648 k
P4 2.4Ghz: 484 k

lsoule · 2005-02-18, 00:48

For k=231, it looks like 629k/s on a P4 2.2GHz

ValerieVonck · 2005-02-18, 07:18

OK thank you.

ValerieVonck · 2005-02-20, 11:30

Currently testing the range 231K => 240k : 576 candidates on my P4 3G.
Continuing sieving the range 500G => 1T on my P4 2.4G.

ValerieVonck · 2005-02-21, 17:05

Range 230K => 240K done. No primes found
Range 240K => 250K currently testing - 674 candidates
Continuing sieving with lower bound 250k.
95886 candidates remaining

ValerieVonck · 2005-02-23, 16:52

Range 240K => 250K done. No primes found
Range 250K => 280K currently testing - 1997 candidates
Continuing sieving with lower n bound 280k.

2005-02-20, 11:30	#20
ValerieVonck Mar 2004 Belgium 7×11² 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

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2005-02-15, 20:36	#12
lsoule Nov 2004 California 2³·3·71 Posts	For comparison, I've sieved 515106735 for k=460k-1M up to 2.5T and still have 78,000 candidates. -Larry

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 2³·3·71 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.

2005-02-21, 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 7·11² Posts	Range 240K => 250K done. No primes found Range 250K => 280K currently testing - 1997 candidates Continuing sieving with lower n bound 280k.