looking for some solutions? You are welcome.

SOLVED: Go away! No-1's Here! – codegolf.stackexchange.com

geokavel: I was playing around with some numbers and found a sequence that, of course, is on OEIS. It is A005823: Numbers whose ternary expansion contains no 1's. It goes: a(2n) = 3*a(n)+2 a(2n+1) = ...

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