A043775 Numbers n such that number of runs in base 3 representation of n is congruent to 2 mod 3.

3, 5, 6, 7, 9, 12, 14, 17, 18, 22, 24, 25, 27, 36, 39, 41, 44, 53, 54, 67, 72, 76, 78, 79, 81, 91, 92, 96, 97, 100, 101, 102, 104, 108, 117, 120, 122, 125, 134, 138, 140, 141, 142, 145, 146, 150, 151, 161, 162, 172, 173, 177, 178, 181