I am considering a problem concerning Cantor set.
Here is my quesion:
Let $N\in\mathbb{N}$.
Is there any way other than direct calculation to determine whether $N$ has no "1" as digits in its ternary expansion?
2026-02-24 03:04:54.1771902294
Determining whether a natural number has no "1"s in its ternary expansion, without direct calculation
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