Even after five minutes, the logic has a (small) hole.
Not all odd spell out the digit: thirteen, fifteen (and maybe eleven?) are odd but don’t have an ‘e’ in the word’s “digit” part, though they obviously do elsewhere.
If the answer is supposed to be logically rigorous, o1 is incomplete for the reason you say.
If I was treating this as a lateral thinking puzzle (does anyone still do those for interview questions?) rather than a sensible request, I'd give numbers in a non-Latin character set, at which point it's easy: 一三五七九
If the answer is supposed to be logically rigorous, o1 is incomplete for the reason you say.
If I was treating this as a lateral thinking puzzle (does anyone still do those for interview questions?) rather than a sensible request, I'd give numbers in a non-Latin character set, at which point it's easy: 一三五七九
(But even this only works for silly games, IMO).