Erdős’s restricted-digit question for powers of two

Determine whether every power of 2 other than 1, 4, and 256 has at least one base-3 digit equal to 2.

Background

The problem concerns the interaction between representations of integers in bases 2 and 3. A counterexample would be a power of 2 whose base-3 expansion uses only the digits 0 and 1. The paper reports that Dimitrov and Hove established that any counterexample would have to be structurally large, specifically requiring a representation as a sum of at least 25 distinct powers of 3, but does not state that the question has been resolved.

References

Erdős asked whether each power of 2, except 1,4 and 256, has a digit in base 3 which is equal to 2.

Ratio of sum of digits functions in two bases  (2608.14241 - Jelinek, 14 Aug 2026) in Section 1, Introduction