A032988 If d,e are consecutive digits of n in base 6, then |d-e|>=4.

1, 2, 3, 4, 5, 11, 24, 30, 31, 66, 67, 148, 149, 184, 185, 191, 400, 401, 407, 888, 894, 895, 1104, 1110, 1111, 1146, 1147, 2400, 2406, 2407, 2442, 2443, 5332, 5333, 5368, 5369, 5375, 6628, 6629, 6664, 6665, 6671, 6880, 6881