decreasing the n-range in the sr5data.txt

Rincewind · 2009-05-17, 19:53

Hi, at the moment we are sieving for

Code:

184 <= n <= 2000000

According to the stats-page

the lowest n for an active test is
for riesel: 289605
and for sierpinski: 328596.
So if we start sieving in a Range

Code:

250000 <= n <= 2000000

we could save some time finding factors. Is it possible to change the range? or is this a bad idea?

masser · 2009-05-20, 01:50

Bad Idea. Those n<=289000 have only been tested once. We like to have matching residues for each k,n pair. In other words, we like to test each candidate twice (at least!) and have matching residues.

This topic has been discussed before; search this subforum for previous discussion of this issue.

Rincewind · 2009-05-20, 05:09

OK, thank you.

2009-05-17, 19:53	#1
Rincewind Oct 2006 67₁₆ Posts	decreasing the n-range in the sr5data.txt Hi, at the moment we are sieving for Code: 184 <= n <= 2000000 According to the stats-page the lowest n for an active test is for riesel: 289605 and for sierpinski: 328596. So if we start sieving in a Range Code: 250000 <= n <= 2000000 we could save some time finding factors. Is it possible to change the range? or is this a bad idea?

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2009-05-20, 01:50	#2
masser Jul 2003 wear a mask 11001111010₂ Posts	Bad Idea. Those n<=289000 have only been tested once. We like to have matching residues for each k,n pair. In other words, we like to test each candidate twice (at least!) and have matching residues. This topic has been discussed before; search this subforum for previous discussion of this issue.

2009-05-20, 05:09	#3
Rincewind Oct 2006 103 Posts	OK, thank you.