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Message boards : The Riesel Problem : TRP Sieve WU question

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Toshio Yamaguchi

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Message 69572 - Posted: 3 Oct 2013 | 16:20:23 UTC

For this WU, the stderr output says "Factors file not found" at the bottom. What does that mean?

KEP

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Message 69573 - Posted: 3 Oct 2013 | 16:57:00 UTC - in response to Message 69572.

That you found no factors in the range that you searched. Eventually if you search far and long enough, you won't see that message, since then you'll have found a factor :)

Pooh Bear 27

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Message 69574 - Posted: 3 Oct 2013 | 17:54:29 UTC

Sieving is removing easier to find non-primes from the field of testing. You get a set of numbers to do this sieving through. Sometimes you find no factors, so all the numbers in that sieve file will be tested in LLR. Sieving doesn't find primes, it finds factors and removes them from prime candidates.

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My lucky numbers are 121*2^4553899-1 and 3756801695685*2^666669Â±1

x3mEn

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Message 69575 - Posted: 3 Oct 2013 | 19:25:21 UTC - in response to Message 69574.

Sometimes you find no factors, so all the numbers in that sieve file will be tested in LLR.

I guess you are not accurate enough.
"No factors" means none of the numbers from the given range of candidates for the role of to factors divides any kÂ·2^n-1 for 56 specific values of k and n <= 50M
So it means nothing about need to test in LLR at all.
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Message boards : The Riesel Problem : TRP Sieve WU question