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Forum: kriesel 2021-01-20, 17:47
Replies: 7
Views: 2,738
Posted By kriesel
What it may look like when something is not working correctly

See https://mersenneforum.org/showpost.php?p=569708&postcount=76
Any of the following are reason to view the interim or final results with suspicion. The original poster was correct to doubt the...
Forum: kriesel 2021-01-20, 17:26
Replies: 7
Views: 2,738
Posted By kriesel
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 ...
Forum: kriesel 2021-01-16, 16:31
Replies: 6
Views: 2,458
Posted By kriesel
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...
Forum: kriesel 2021-01-13, 23:25
Replies: 27
Views: 8,800
Posted By kriesel
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...
Forum: kriesel 2021-01-13, 16:34
Replies: 14
Views: 4,926
Posted By kriesel
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:...
Forum: kriesel 2021-01-03, 19:08
Replies: 14
Views: 4,926
Posted By kriesel
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...
Forum: kriesel 2020-12-30, 15:19
Replies: 1
Views: 153
Posted By kriesel
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...
Forum: kriesel 2020-12-30, 02:55
Replies: 1
Views: 153
Posted By kriesel
Knight's Corner PCIe 7120A Coprocessor

This thread is intended as a reference thread for Mersenne exponents of special forms. For discussion, please use the reference discussion thread...
Forum: kriesel 2020-12-30, 00:16
Replies: 0
Views: 85
Posted By kriesel
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...
Forum: kriesel 2020-12-24, 21:23
Replies: 6
Views: 203
Posted By kriesel
Personally significant dates encoded into exponents

The idea of encoding personally significant dates into exponents came up in https://www.mersenneforum.org/showpost.php?p=549304&postcount=8 and has no more mathematical merit than trying to pick a...
Forum: kriesel 2020-12-24, 18:18
Replies: 6
Views: 203
Posted By kriesel
Prime approximations of round multiples of irrational numbers

Consider r = c x 10n x b, where b is an irrational number such as pi, e, sqrt(2), sqrt(3), sqrt(5), sqrt(10), etc and where c, n are are small positive integers chosen such that 108< r < 109. And...
Forum: kriesel 2020-12-24, 18:10
Replies: 6
Views: 203
Posted By kriesel
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, ...
Forum: kriesel 2020-12-24, 18:07
Replies: 6
Views: 203
Posted By kriesel
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,...
Forum: kriesel 2020-12-24, 18:00
Replies: 6
Views: 203
Posted By kriesel
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...
Forum: kriesel 2020-12-24, 17:56
Replies: 6
Views: 203
Posted By kriesel
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...
Forum: kriesel 2020-12-24, 17:51
Replies: 6
Views: 203
Posted By kriesel
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...
Forum: kriesel 2020-12-16, 17:25
Replies: 18
Views: 4,881
Posted By kriesel
Why don't we use 2 instead of 3 as the base for PRP or P-1 computations?

Mersenne numbers are base-2 pseudoprimes. All would be indicated as prime in P-1 factoring or Fermat PRP tests, whether actually prime or composite. Using 3 as the base provides useful information,...
Forum: Math 2020-12-16, 16:37
Replies: 16
Views: 593
Posted By kriesel
No one responded to the OP for hours. While I was...

No one responded to the OP for hours. While I was trying to help, and understand/remember myself, researching an answer, and composing, previewing, and formatting one...
Forum: Cloud Computing 2020-12-16, 16:16
Replies: 1,123
Views: 75,380
Posted By kriesel
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...
Forum: Marin's Mersenne-aries 2020-12-16, 15:16
Replies: 899
Views: 57,821
Posted By kriesel
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...
Forum: Math 2020-12-16, 11:59
Replies: 16
Views: 593
Posted By kriesel
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...
Forum: ONeil 2020-12-16, 09:45
Replies: 84
Views: 1,610
Posted By kriesel
And engineering made the benefits from all those...

And engineering made the benefits from all those fields not merely possible, but practical and economical and so widespread.
Forum: Math 2020-12-15, 21:28
Replies: 16
Views: 593
Posted By kriesel
Instead of criticizing from the stands, try...

Instead of criticizing from the stands, try entering the arena. "It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done...
Forum: Lounge 2020-12-15, 14:37
Replies: 8
Views: 527
Posted By kriesel
The last 25 years has been more fruitful for...

The last 25 years has been more fruitful for Mersenne prime finding, than any other similar length time span in history. There have been centuries with no finds. https://www.mersenne.org/primes/
Forum: Math 2020-12-15, 01:30
Replies: 16
Views: 593
Posted By kriesel
E is not just the product of the primes < B1,...

E is not just the product of the primes < B1, it's the product of maximum integral powers of each prime fitting < B1 individually, called powersmooth.
The exponentiation aE*2*p is done mod Mp. So...
Showing results 1 to 25 of 1000

 
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