A032974 Numbers n with property that all pairs of consecutive base 3 digits differ by 0 or 1.

1, 2, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14, 16, 17, 21, 22, 23, 25, 26, 27, 28, 30, 31, 32, 36, 37, 39, 40, 41, 43, 44, 48, 49, 50, 52, 53, 63, 64, 66, 67, 68, 70, 71, 75, 76, 77, 79, 80, 81, 82, 84, 85, 86, 90, 91, 93, 94, 95, 97, 98, 108, 109, 111