Forum: Information & Answers
2022-06-19, 04:17
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Replies: 2
Views: 282
It is more efficient to use the full mersenne...
It is more efficient to use the full mersenne number for the FFT operations (because of its special form) rather than just the unfactored part. In fact, even if the unfactored part was just half the...
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Forum: FactorDB
2022-06-14, 09:41
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Replies: 561
Views: 105,181
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Forum: Data
2022-06-12, 03:59
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Replies: 148
Views: 11,405
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Forum: PrimeNet
2022-06-10, 09:53
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Replies: 131
Views: 32,428
https://www.mersenne.ca/exponent/194544733 and...
https://www.mersenne.ca/exponent/194544733 and https://www.mersenne.ca/exponent/194546867 suggests the factors were previously known; merely that the "factor found" entry is not there in primenet.
...
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Forum: Data
2022-06-04, 05:24
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Replies: 588
Views: 122,833
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Forum: Data
2022-06-04, 02:03
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Replies: 588
Views: 122,833
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Forum: Software
2022-05-28, 14:33
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Replies: 5
Views: 311
We store about 18 bits per IEEE fp64, so it is...
We store about 18 bits per IEEE fp64, so it is more lime 6-7M. But I guess that just strengthens your case.
Modern processors can do 8-16 floating point ops/cycles (including muls & adds). Data...
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Forum: Software
2022-05-27, 05:03
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Replies: 654
Views: 106,387
No. Only (p, 2p+1) is SG
When...
No. Only (p, 2p+1) is SG
When p=k*2^n-1, 2p+1 = k*2^(n+1)-1. Both are easily provable by LLR.
When p=k*2^n+1, 2p+1 = k*2^(n+1)+3, but is still provable, since, by definition, we have 100%...
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Forum: Lone Mersenne Hunters
2022-05-23, 17:17
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Replies: 2,162
Views: 324,347
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Forum: Soap Box
2022-05-23, 01:54
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Replies: 43
Views: 1,226
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Forum: Software
2022-05-23, 01:35
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Replies: 613
Views: 49,165
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Forum: Software
2022-05-22, 16:48
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Replies: 613
Views: 49,165
It is. But the essential nature of stage 2...
It is. But the essential nature of stage 2 remains, i.e. k must have one factor between B1 & B2. That doesn't change just because you checked for the factor (i.e. did a gcd) multiple times during...
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Forum: Software
2022-05-22, 15:58
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Replies: 613
Views: 49,165
2*k*p+1
Yes, but not specific to 30.8
...
2*k*p+1
Yes, but not specific to 30.8
It is not so much a problem as it is a limitation of the P-1 algorithm.
For smaller exponents, this shouldn't cost much. But how would this help...
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Forum: Software
2022-05-22, 04:41
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Replies: 613
Views: 49,165
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Forum: Miscellaneous Math
2022-05-14, 09:20
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Replies: 572
Views: 71,117
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Forum: Information & Answers
2022-05-12, 15:14
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Replies: 12
Views: 506
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Forum: GPU Computing
2022-05-12, 12:25
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Replies: 7
Views: 730
K80 produces 110 GHz D/d on PRP tests. It...
K80 produces 110 GHz D/d on PRP tests. It produces 800 GHz D/d on TF.
If factoring is what you want to do, GTX 16xx, RTX 20xx and RTX 30xx are the things to get. For example, 1650 produces 800...
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Forum: Information & Answers
2022-05-12, 02:31
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Replies: 12
Views: 506
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Forum: Information & Answers
2022-05-12, 02:25
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Replies: 12
Views: 506
Isn't it the former? i.e. How many hours the...
Isn't it the former? i.e. How many hours the program will run as opposed to how many hours the human is sitting in front of the computer? I am not sure I understood the OP's question correctly, but...
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Forum: Software
2022-05-11, 15:14
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Replies: 613
Views: 49,165
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Forum: mersenne.ca
2022-05-11, 09:58
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Replies: 928
Views: 124,080
Not that I'm aware of. I am aware of one...
Not that I'm aware of. I am aware of one condition under which it outputs composite factor, which is when the composite factor is of the correct size. Eg:- Suppose a number has a 35-bit and 40-bit...
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Forum: mersenne.ca
2022-05-11, 02:15
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Replies: 928
Views: 124,080
Considering the fact that a) TF doesn't find...
Considering the fact that a) TF doesn't find composite factors (outside the bit depth), b) the factors are P-1 smooth, and c) missed another factor in the range, this is almost certainly a P-1 find.
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Forum: PrimeNet
2022-04-29, 17:33
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Replies: 8
Views: 583
mersenne.org doesn't give this information....
mersenne.org doesn't give this information. mersenne.ca does: https://www.mersenne.ca/exponent/900011207
But those are the limits, not the actual TF already done.
The fact that you were given...
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Forum: Software
2022-04-24, 10:14
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Replies: 613
Views: 49,165
30.8 uses a bigger FFT for stage 2. This...
30.8 uses a bigger FFT for stage 2. This information is included in the submitted result, so the server grants bigger credit. Obviously the difference in credit is dependent on the difference in FFT...
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Forum: Software
2022-04-24, 07:55
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Replies: 613
Views: 49,165
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