This is an old unsolved problem. [Erdos][3] conjectured (see the first problem in that paper) that for all $n\ge 9$ the ternary expansion of $2^n$ contains the ternary digit $2$ (this is equivalent to for every $n\ge 10$ the ternary expansion of $2^n$ contains a $1$). For recent work related to this (and references) see these papers of [Abram and Lagarias][1], and [Lagarias][2]. [1]: http://arxiv.org/pdf/1308.3133v1.pdf [2]: http://arxiv.org/pdf/math/0512006.pdf [3]: https://www.renyi.hu/~p_erdos/1979-22.pdf