A023718 Numbers with a single 3 in their base 4 expansion.

3, 7, 11, 12, 13, 14, 19, 23, 27, 28, 29, 30, 35, 39, 43, 44, 45, 46, 48, 49, 50, 52, 53, 54, 56, 57, 58, 67, 71, 75, 76, 77, 78, 83, 87, 91, 92, 93, 94, 99, 103, 107, 108, 109, 110, 112, 113, 114, 116, 117, 118, 120, 121, 122, 131, 135