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.
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