Forum: Software
2019-07-27, 06:54
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Replies: 7
Views: 1,171
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Forum: Software
2019-07-19, 20:16
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Replies: 7
Views: 1,171
p-1 issue with Prime95
There seems to be a problem with p-1 test on certain numbers by Prime95.
I'm testing numbers of the form 2*3^n+1 (Williams numbers MP 3).
p-1 test by Prime95 fails to find most of the smooth...
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Forum: Software
2018-10-15, 13:09
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Replies: 441
Views: 78,597
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Forum: Software
2018-10-15, 11:30
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Replies: 441
Views: 78,597
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Forum: PrimeNet
2018-03-22, 14:34
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Replies: 2,226
Views: 227,996
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Forum: GPU Computing
2017-08-15, 13:29
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Replies: 293
Views: 70,622
Your idea seems like a great concept.
Now we...
Your idea seems like a great concept.
Now we mostly need a change in the general attitude - that a 99.9% correct PRP-test is better than a 97% (or 98.5%) correct P-test.
Perhaps all future...
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Forum: GPU Computing
2017-08-10, 07:18
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Replies: 293
Views: 70,622
Not exactly. The scanario applies to the case...
Not exactly. The scanario applies to the case where, after an indication of failure, you decide to start all over from the beginning but already have interim residues at some intervals saved. You go...
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Forum: GPU Computing
2017-08-09, 09:16
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Replies: 293
Views: 70,622
This would probably depend on the frequency of...
This would probably depend on the frequency of the errors caught.
If single errors are observed only during a few complete tests and there are many (at least apparently) good tests in between,...
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Forum: GPU Computing
2017-08-09, 08:53
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Replies: 293
Views: 70,622
Nice presentation!
But I did not understand...
Nice presentation!
But I did not understand why it is a problem if r < 0
Since (a*b|n) = (a|n)(b|n) and (-1|n) = (-1)^((n-1)/2), isn't (-r|n) = (r|n)(-1)^((n-1)/2) so that the negative value...
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Forum: GPU Computing
2017-08-08, 10:33
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Replies: 293
Views: 70,622
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Forum: GPU Computing
2017-08-08, 08:23
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Replies: 293
Views: 70,622
At the beginning R0 = 4
This is always...
At the beginning R0 = 4
This is always (R0+2/Mp) = -1 and (R0-2/Mp) = 1
The next residue is R1 = R0^2-2
This computes as (R1+2/Mp) = (R0^2/Mp) = 1 and (R1-2/Mp) = (R0^2-4/Mp) =...
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Forum: GPU Computing
2017-08-08, 05:56
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Replies: 293
Views: 70,622
Ah, OK. See...
Ah, OK. See https://en.wikipedia.org/wiki/Jacobi_symbol
Basically you check the numbers mod 4 or 8, swap them around, take the remainder, and repeat until you end up with 1 or 2.
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Forum: GPU Computing
2017-08-08, 05:33
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Replies: 293
Views: 70,622
You mean it is too tedious?
You could do...
You mean it is too tedious?
You could do that at every 10^6 iterations or whatever with marginal overall cost and still save a lot of time potentially. If it flips anywhere in between, you have a...
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Forum: GPU Computing
2017-08-07, 17:50
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Replies: 293
Views: 70,622
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Forum: PrimeNet
2017-05-08, 13:22
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Replies: 2,226
Views: 227,996
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Forum: PrimeNet
2017-05-08, 11:53
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Replies: 2,226
Views: 227,996
Manual results submission problem
There is another problem with manual submissions -
For some exponents I get a message like this:
processing: TF factor 15750471591088124777 for M17086021 (https://www.mersenne.org/M17086021)...
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Forum: Hardware
2016-11-21, 18:18
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Replies: 35
Views: 3,848
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Forum: Hardware
2016-11-20, 12:27
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Replies: 35
Views: 3,848
Could be a problem with the power supply (bad...
Could be a problem with the power supply (bad capacitor).
I had similar issue and found solution from this link:
https://www.techpowerup.com/forums/threads/my-gigabit-switch.46452/
I replaced...
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Forum: PrimeNet
2015-01-22, 14:11
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Replies: 544
Views: 67,085
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Forum: PrimeNet
2014-09-13, 16:40
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Replies: 2,226
Views: 227,996
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Forum: PrimeNet
2014-09-13, 11:59
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Replies: 2,226
Views: 227,996
ECM factors are not accepted as manual...
ECM factors are not accepted as manual submission. Asks for a checksum which is not there.
"Factor found" is not accompanied by a checksum (presumably because factors can not be faked).
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Forum: PrimeNet
2014-09-12, 15:14
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Replies: 2,226
Views: 227,996
Originally Posted by error...
Originally Posted by error http://www.mersenneforum.org/images/buttons/viewpost.gif (http://www.mersenneforum.org/showthread.php?p=382881#post382881)
Manual results form does not...
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Forum: PrimeNet
2014-09-12, 08:36
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Replies: 2,226
Views: 227,996
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