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Old 2005-04-08, 07:23   #12
robert44444uk
 
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Default Dont know

I didn't know there was an upper limit, I just do it!

I am using version 2.81, and I set max Mb ram to 100.0

I ran n=71 last night - only one value survived the sieve and the first pfgw run, and that turned out to be composite for k.2^71-1

So Anx1's record still stands.

Regards

Robert
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Old 2005-04-08, 08:53   #13
Templus
 
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I tried n=81 yesterday for 2<k<2^32. As far as I know, there is no upperbound, since NewPGen splits this large range into smaller pieces (dependent on the max. RAM assigned?) and sieves these ranges until 1 billion.

As I said, I tested n=81 yesterday with OpenPFGW and there was no complete set in the log-file. I still have the sieve file, so anyone who wishes to redo it can ask me for the sieve-file. I uploaded the sieve file on http://www.diamondvalley.nl/octoproth

I'm taking 82+....sieving until k=2^32 takes about 1,5 or 2 hours for me. Testing these numbers for PRP is done in less than a minute (small n)

Last fiddled with by Templus on 2005-04-08 at 09:04
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Old 2005-04-08, 10:49   #14
ltd
 
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Are n=74,75,76 free ?

I would like to test them.

Lars
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Old 2005-04-08, 11:00   #15
axn
 
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Quote:
Originally Posted by robert44444uk
I didn't know there was an upper limit, I just do it!

I am using version 2.81, and I set max Mb ram to 100.0
Hmmm.... Must be the version. I am using 2.82. If I put k higher than 2^32-1 it just wont budge :

But on the plus side, I went and wrote up a sieve program for myself. The initial results are *very* encouraging. I sieve all 8 forms simultaneously.

Some statistics. After sieveing for k < 10^10, with p < 1M, I get just 90 (count'em) candidates
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Old 2005-04-08, 11:35   #16
axn
 
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And the winner is:

k=61574201535, n=80
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Old 2005-04-08, 13:26   #17
robert44444uk
 
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Quote:
Originally Posted by ltd
Are n=74,75,76 free ?

I would like to test them.

Lars
You might want to try a bit higher, given the latest record. This is addictive!!

Regards

Robert Smith
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Old 2005-04-08, 15:17   #18
ltd
 
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OK i take 100,101,102

Lars
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Old 2005-04-08, 16:01   #19
axn
 
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Another one for n = 80

k = 632893190475 !!
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Old 2005-04-08, 16:17   #20
axn
 
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n = 80 finished for k < 10^12. On to bigger n's
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Old 2005-04-08, 21:26   #21
ltd
 
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Quote:
Originally Posted by axn1
Hmmm.... Must be the version. I am using 2.82. If I put k higher than 2^32-1 it just wont budge :
Strange i use 2.82 also and i have no problems sieving >2^32.
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Old 2005-04-09, 06:21   #22
axn
 
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Quote:
Originally Posted by ltd
Strange i use 2.82 also and i have no problems sieving >2^32.
D'oh! It looks like I've run into a bug in NewPGen. Try putting kmax = 4294967296 (2^32). It doesnt do anything. If you put any other number in there (including really big numbers), it springs into action!

Well, anyway, my new sieve is a lot better suited for this search.
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