HP 49G Programming Challenge: OEIS A014261, Integers with exclusively Odd Digits

[Didier Lachieze]

(08-30-2017 09:06 AM)pier4r Wrote:  - the other idea is to get the Nth number, convert it in base 5. And then substitute the digits (having the number seen as string) with a mapping. So for example:
13th number, in base 5 it is 23, substitute 2 with 3 (2nd element in the list) and 3 with 5 (5th element in the list). So I get 35. (as you can see, it is like string processing)

I had initially the same idea but failed to implement it, for example the 24th number is 77, 24 in base 5 is 44 so you can easily convert it to 77, however if you look at the next one, the 25th should be 79 but 25 in base 5 is 100 and you start to have issues to convert that to 79…