Forum: Software
2022-06-30, 12:06
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Replies: 8
Views: 267
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Forum: Information & Answers
2022-06-27, 16:21
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Replies: 26
Views: 783
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Forum: Information & Answers
2022-06-27, 15:56
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Replies: 26
Views: 783
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Forum: Information & Answers
2022-06-26, 13:29
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Replies: 6
Views: 506
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Forum: Information & Answers
2022-06-19, 04:17
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Replies: 6
Views: 506
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: 105,631
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Forum: Data
2022-06-12, 03:59
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Replies: 149
Views: 11,720
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Forum: PrimeNet
2022-06-10, 09:53
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Replies: 131
Views: 32,551
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: 123,198
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Forum: Data
2022-06-04, 02:03
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Replies: 588
Views: 123,198
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Forum: Software
2022-05-28, 14:33
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Replies: 5
Views: 335
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: 106,858
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: 326,241
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Forum: Soap Box
2022-05-23, 01:54
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Replies: 43
Views: 1,276
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Forum: Software
2022-05-23, 01:35
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Replies: 613
Views: 50,133
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Forum: Software
2022-05-22, 16:48
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Replies: 613
Views: 50,133
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: 50,133
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: 50,133
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Forum: Miscellaneous Math
2022-05-14, 09:20
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Replies: 572
Views: 71,819
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Forum: Information & Answers
2022-05-12, 15:14
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Replies: 12
Views: 546
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Forum: GPU Computing
2022-05-12, 12:25
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Replies: 7
Views: 765
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: 546
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Forum: Information & Answers
2022-05-12, 02:25
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Replies: 12
Views: 546
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: 50,133
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Forum: mersenne.ca
2022-05-11, 09:58
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Replies: 928
Views: 124,571
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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