20220522, 09:31  #34 
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
2^{2}·5^{3}·23 Posts 
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. Last fiddled with by xilman on 20220522 at 09:33 Reason: Add first sentence 
20220523, 09:46  #35  
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
2^{2}·5^{3}·23 Posts 
Quote:
It seems to be much more appropriate in the Hobbies/Astronomy subforum. Last fiddled with by xilman on 20220523 at 09:47 Reason: Add URL 

20220523, 18:11  #36  
Jun 2012
Boulder, CO
2·211 Posts 
Quote:


20220528, 14:29  #37 
"99(4^34019)99 palind"
Nov 2016
(P^81993)SZ base 36
7^{2}×73 Posts 
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 A239638, 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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