A043709 Numbers whose base-6 representation has an odd number of runs.
1, 2, 3, 4, 5, 7, 14, 21, 28, 35, 37, 38, 39, 40, 41, 43, 48, 49, 51, 52, 53, 54, 55, 56, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 73, 74, 75, 76, 77, 78, 80, 81, 82, 83, 86, 90, 91, 92, 94, 95, 96, 97, 98, 99, 101, 102, 103, 104
Offset: 1