A097585 Binary representation of n if n is prime, otherwise the ternary representation of n.

1, 10, 11, 11, 101, 20, 111, 22, 100, 101, 1011, 110, 1101, 112, 120, 121, 10001, 200, 10011, 202, 210, 211, 10111, 220, 221, 222, 1000, 1001, 11101, 1010, 11111, 1012, 1020, 1021, 1022, 1100, 100101, 1102, 1110, 1111, 101001, 1120, 101011, 1122, 1200