Talk:Strange plus numbers: Difference between revisions

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Revision as of 10:17, 23 February 2021

Help with Description

Is there an external, more decriptive link for "strange plus numbers"? Can someone help with the description? Thanks. --Paddy3118 (talk) 07:37, 23 February 2021 (UTC)

It seems that strange numbers and strange plus numbers have been coined by CalmoSoft. The web seems to know nothing of them. 498 is a 'strange plus number' because 4+9 is prime and 9+8 is prime. Every sum of adjacent pairs of digits must be prime. --Chunes (talk) 08:13, 23 February 2021 (UTC)

This would seem to exclude all 1-digit numbers from being 'strange plus numbers,' but I'm no expert. --Chunes (talk) 08:16, 23 February 2021 (UTC)

There's something here but the definition is not the same as CalmoSoft's. Curiously, he always misses off the first column of output in his Ring solutions.

Hope there's not going to be too many of these - don't want another unixdict.txt situation! --PureFox (talk) 10:17, 23 February 2021 (UTC)

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 : It seems that strange numbers and strange plus numbers have been coined by CalmoSoft. The web seems to know nothing of them. 498 is a 'strange plus number' because 4+9 is prime and 9+8 is prime. Every sum of adjacent pairs of digits must be prime. --[[User:Chunes|Chunes]] ([[User talk:Chunes|talk]]) 08:13, 23 February 2021 (UTC)
 :: This would seem to exclude all 1-digit numbers from being 'strange plus numbers,' but I'm no expert. --[[User:Chunes|Chunes]] ([[User talk:Chunes|talk]]) 08:16, 23 February 2021 (UTC)
+::: There's something [https://nrich.maths.org/722 here] but the definition is not the same as CalmoSoft's. Curiously, he always misses off the first column of output in his Ring solutions.
+::: Hope there's not going to be too many of these - don't want another ''unixdict.txt'' situation! --[[User:PureFox|PureFox]] ([[User talk:PureFox|talk]]) 10:17, 23 February 2021 (UTC)