# Talk:Strange plus numbers

## 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)

- There appears to be a logic error in his code. Think the last bit should be:
- <lang ring>if flag = 1

see " " + str row = row + 1 if row % 10 = 0 see nl ok

ok</lang> --PureFox (talk) 10:55, 23 February 2021 (UTC)

- @Chunes If the condition is "the sum of two consecutive digits is always prime", then one-digit numbers should be considered strange (it's vacuously true that for all pairs of consecutive digits the sum is prime). In the C solution I added a condition on n<10 to force them to be non-strange, but it's easy to remove. We could change the task to solve the general solution and decide what to do with one-digit numbers (I think it's better to have them strange). Bastet (talk) 13:33, 24 February 2021 (UTC)

Hello PureFox. I changed the code as you suggested (CalmoSoft)

- Good, thanks. Incidentally, I was just adding a Go entry to your [Strange numbers] task, when I noticed there was a similar problem with your Ring entry. Same fix again, I think :) --PureFox (talk) 10:14, 25 February 2021 (UTC)