Forum: kriesel
2021-01-24, 19:20
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Replies: 0
Views: 86
Announcements
Important!
Please switch for first tests, to PRP testing, with the excellent Gerbicz Error Check, and VDF based verification of correct completion ("proof"), wherever practical, instead of doing LL...
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Forum: PrimeNet
2021-01-24, 12:02
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Replies: 111
Views: 7,570
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Forum: kriesel
2021-01-23, 00:02
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Replies: 15
Views: 5,150
Mersenne semiprimes
http://oeis.org/A092561 lists Mersenne numbers that are semiprimes without regard to whether n is composite.
n Mn
4 15,
9 511,
11 2047,
23 8388607,
37 137438953471,
41 2199023255551,
49...
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Forum: kriesel
2021-01-22, 16:45
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Replies: 7
Views: 272
Large exponents
Here, large is defined as an exponent beyond the mersenne.org limit, currently 109, which is almost 230
Before considering larger exponents, it's useful to consider the scale of effort needed near...
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Forum: kriesel
2021-01-20, 17:47
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Replies: 7
Views: 2,878
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Forum: kriesel
2021-01-20, 17:26
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Replies: 7
Views: 2,878
V17.0 apparently normal run
From the beginning of a .stat file (V17.0 I think):
INFO: no restart file found...starting run from scratch.
M332220523: using FFT length 18432K = 18874368 8-byte floats.
this gives an average ...
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Forum: kriesel
2021-01-16, 16:31
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Replies: 6
Views: 2,549
What is this beast called?
I looked for something related to this by starting with the OEIS for Mersenne exponents for known primes https://oeis.org/A000043, but didn't find anything that seemed related to this exploding...
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Forum: kriesel
2021-01-13, 23:25
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Replies: 27
Views: 9,066
Performance variables for gpuowl
At least the following, to varying degrees:
The gpu model has a great deal of effect. Radeon VII or RX6x00 preferred for performance/cost ratio. See https://www.mersenne.ca/cudalucas.php
OS...
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Forum: kriesel
2021-01-13, 16:34
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Replies: 15
Views: 5,150
Windows Subsystem for Linux (WSL)
early draft, maybe becomes a whole thread
Requirements:
64-bit hardware supported by Windows
WSL1: Windows 10 x64 v1607 or later per https://www.computerhope.com/issues/ch001879.htm
WSL2:...
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Forum: kriesel
2021-01-03, 19:08
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Replies: 15
Views: 5,150
Donations
To donate to mersenne.org (https://www.mersenne.org/):
https://www.mersenne.org/donate/ via paypal or mail https://www.mersenneforum.org/showpost.php?p=516111&postcount=1...
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Forum: kriesel
2020-12-30, 15:19
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Replies: 1
Views: 168
Installation
The 7120A device is a dual-slot PCIe card requiring up to 300W; 75W from the PCIe socket, 75W from a 6-pin power connector, and 150W from an 8pin power connector. At idle, the 7120A PCIe...
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Forum: kriesel
2020-12-30, 02:55
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Replies: 1
Views: 168
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Forum: kriesel
2020-12-30, 00:16
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Replies: 0
Views: 92
Xeon Phi
This is intended as a reference thread. Do not post here. Post comments at https://www.mersenneforum.org/showthread.php?t=23383 instead. Posts placed here may be moved or deleted without warning or...
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Forum: kriesel
2020-12-24, 21:23
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Replies: 7
Views: 272
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Forum: kriesel
2020-12-24, 18:18
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Replies: 7
Views: 272
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Forum: kriesel
2020-12-24, 18:10
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Replies: 7
Views: 272
Palindromic numbers as exponents
Palindromic numbers (https://en.wikipedia.org/wiki/Palindromic_number) are numbers that are reversible digit by digit without changing value. 110505011 is an example, which as a Mersenne exponent, ...
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Forum: kriesel
2020-12-24, 18:07
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Replies: 7
Views: 272
Repdigits and near-repdigits
Repdigits (https://en.wikipedia.org/wiki/Repdigit) are numbers consisting only of repetition of the same digit value. (Single-digit numbers are excluded by definition.)
For Mersennes' exponents,...
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Forum: kriesel
2020-12-24, 18:00
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Replies: 7
Views: 272
Straights
These are exponents such as 160456789 which also sometimes come up in dubious claims or guesses as exponents of Mersenne primes (https://www.mersenneforum.org/showpost.php?p=548628&postcount=20). In...
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Forum: kriesel
2020-12-24, 17:56
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Replies: 7
Views: 272
Mersenne rhymes
As used here, a rhyme is an exponent that has in common several rightmost digits with another, in the same order. Rhymes in one number base likely will not be rhymes in most others, or only to...
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Forum: kriesel
2020-12-24, 17:51
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Replies: 7
Views: 272
Exponents of particular forms
This thread is intended as a reference thread for Mersenne exponents of special forms. For discussion, please use the reference discussion thread...
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Forum: kriesel
2020-12-16, 17:25
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Replies: 18
Views: 5,003
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Forum: Math
2020-12-16, 16:37
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Replies: 16
Views: 615
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Forum: Cloud Computing
2020-12-16, 16:16
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Replies: 1,128
Views: 77,040
Yes. All GIMPS computation types are possible...
Yes. All GIMPS computation types are possible there on either cpu or gpu. But, latency can be a problem. Expiration can be a problem for wavefront primality first tests or higher. And CUDAPm1 did not...
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Forum: Marin's Mersenne-aries
2020-12-16, 15:16
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Replies: 900
Views: 59,569
Took / registered following, ETA 5 and 10 days...
Took / registered following, ETA 5 and 10 days respectively, assuming 24/7 running:
Cat 2
Doublecheck=56431363,74,1
Doublecheck=56495983,74,1 Also took, registered, following, ETA ~4 days for...
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Forum: Math
2020-12-16, 11:59
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Replies: 16
Views: 615
Quoting was sufficient. Over time, patterns...
Quoting was sufficient. Over time, patterns emerge. There are some on the forum whose contributions are quite commonly cynical or critical and not so commonly constructive or enlightening. The...
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