Numbers n such that n = 4^d_1 + 4^d_2 + ... + 4^d_k where d_1d_2...d_k is the decimal expansion of n.

A139410

Numbers n such that n = 4^d_1 + 4^d_2 + ... + 4^d_k where d_1d_2...d_k is the decimal expansion of n.