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xilman 2022-05-22 09:31

[QUOTE=chalsall;606225]Or, even, simply not have WinBlows in the equation at all.[/QUOTE]
I withdraw my earlier remark.

There are some unusual systems which appear to require Windows.

The only driver for my observatory dome is exclusively Windows. There doesn't appear to be anything for Linux or MacOS, and I have looked very hard.

It might, just might, run under WINE but I really don't want to put that much effort into something which may not work anyway.

xilman 2022-05-23 09:46

[QUOTE=xilman;606245]I withdraw my earlier remark.

There are some unusual systems which appear to require Windows.

The only driver for my observatory dome is exclusively Windows. There doesn't appear to be anything for Linux or MacOS, and I have looked very hard.

It might, just might, run under WINE but I really don't want to put that much effort into something which may not work anyway.[/QUOTE]@chasall: I started replying to your response here but realised we were too off-topic even for a thread titled "off-topic".

It seems to be much more appropriate in the [URL="https://mersenneforum.org/showthread.php?t=27813"]Hobbies/Astronomy sub-forum[/URL].

ryanp 2022-05-23 18:11

[QUOTE=sweety439;606196]Can you prove the primality of these PRPs which are in order to prove the [URL="https://docs.google.com/document/d/e/2PACX-1vRIjefeGFY7nLpTYSns3JP-aYWGb-4_manLoe1byWwzKmYEW147JaHaC0SfyHF7mwvK29FgpcOr1XfA/pub"]Riesel[/URL] and [URL="https://docs.google.com/document/d/e/2PACX-1vTTLkSb4eY0H19p109lzHjhc-D56gqD9WxyyfQgx_3IEsm2JuA9-cTi1ysy-ahe7RNmc4b9OKKSpYh0/pub"]Sierpinski[/URL] conjecture?

* (79*73^9339-1)/6 (R73)
* (27*91^5048-1)/2 (R91)
* (133*100^5496-1)/33 (R100)
* (3*107^4900-1)/2 (R107)
* (27*135^3250-1)/2 (R135)
* (201*141^5279-1)/20 (R141)
* (1*174^3251-1)/173 (R174)
* (11*175^3048-1)/2 (R175)
* (191*105^5045+1)/8 (S105)
* (11*256^5702+1)/3 (S256)[/QUOTE]

I did one of these as a warmup for testing out cm 0.4.1-dev with Paul Underwood's [C]gw_prp[/C] [STRIKE]hack[/STRIKE] enhancement. You should work on the others yourself.

sweety439 2022-05-28 14:29

Does such repunit exist?
 
Is there a repunit Rp with p prime, such that 2*p+1 is prime, and Rp/(2*p+1) is also prime, in base 10? In base 2, there are many such p's: {11, 23, 83, 131, 3359, 130439, 406583, ...}, see [URL="https://oeis.org/A239638"]A239638[/URL], also in base 3, there are such p's: {5, 11, 23, 131}, in base 6, the only known such p is 11, but in base 10, I check to 100000 without finding any such prime p, so, is there a prime p such that 2*p+1 is prime, and Rp/(2*p+1) is also prime? (i.e. is there a prime p such that the repunit Rp is a semiprime, and 2*p+1 is a factor of it?)


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