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Old 2020-10-24, 20:42   #12
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GPU models no longer available to me for test
GTX 480
Tesla C2075
GTX 1070
GTX 1080Ti

Last fiddled with by kriesel on 2021-01-29 at 17:08
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Old 2020-12-08, 22:29   #13
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Default Software etc for numbers of other forms

Someday, maybe, summarize software, computation type, hardware type, number name, formula, useful threads etc for non-Mersenne-numbers


Last fiddled with by kriesel on 2020-12-08 at 22:46
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Old 2021-01-03, 19:08   #14
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Last fiddled with by kriesel on 2021-01-15 at 17:06
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Old 2021-01-13, 16:34   #15
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Default Windows Subsystem for Linux (WSL)

early draft, maybe becomes a whole thread

64-bit hardware supported by Windows
WSL1: Windows 10 x64 v1607 or later per
WSL2: Windows10 x64 ~v1909 or later, and a processor that supports vritualization (VT-X?), from personal experience.

Checking whether WSL is installed and what version: in a Windows command prompt, "wsl -l -v"
And it can be useful to "title wsl check" and leave the small command prompt box open as a reminder.
  NAME      STATE           VERSION
* Ubuntu    Stopped         1
Unless there is WSL but no Linux distro installed:
C:\users\User\Documents>wsl -l -v
Windows Subsystem for Linux has no installed distributions.
Distributions can be installed by visiting the Microsoft Store:
Or if WSL is not installed either:
'wsl' is not recognized as an internal or external command,
operable program or batch file.
Differences between WSL1 and WSL2

Installing WSL2: update to required Windows 10 version or higher.
For x64 systems: Version 1903 or higher, with Build 18362 or higher.
For ARM64 systems: Version 2004 or higher, with Build 19041 or higher.
Install WSL 1. Then update to WSL 2.

Simplified WSL2 install: Windows 10 build 20262 or higher

A handy reference, including adding GUI and RDP to WSL

Top of reference tree:
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Last fiddled with by kriesel on 2021-02-02 at 18:38
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Old 2021-01-23, 00:02   #16
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Default Mersenne semiprimes

Semiprimes are natural numbers that are products of exactly two factors other than one and themselves (and they may be squares). 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 562949953421311,
59 576460752303423487,
67 147573952589676412927,
83 9671406556917033397649407,
97 158456325028528675187087900671,
101 2535301200456458802993406410751

Subsetting to prime exponent < 100 gives
p for Mp and factors
11 2047 f=23; 89
23 8,388,607 f=47; 178481
37 137438953471 f=223; 616318177
41 2,199,023,255,551 f=13367, 164,511,353
59 576,460,752,303,423,487 f= 179951, 3 203431 780337
67 147,573,952,589,676,412,927 = 193 707721 × 761838 257287
83 9,671,406,556,917,033,397,649,407 = 167 × 57912 614113 275649 087721
97 158,456,325,028,528,675,187,087,900,671 = 11447 × 13 842607 235828 485645 766393
below p=100, 8 Mersenne semiprimes of prime exponent vs. 10 Mersenne primes.

in p= 100 to 200, 8 semiprimes vs. only 2 primes of prime exponent.
in p=200 to 500, 9 vs 0.

Last fiddled with by kriesel on 2021-01-29 at 17:22 Reason: add a semiprime definition and link
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