A039099 Numbers n such that representation in base 9 has same number of 3's and 6's.

0, 1, 2, 4, 5, 7, 8, 9, 10, 11, 13, 14, 16, 17, 18, 19, 20, 22, 23, 25, 26, 33, 36, 37, 38, 40, 41, 43, 44, 45, 46, 47, 49, 50, 52, 53, 57, 63, 64, 65, 67, 68, 70, 71, 72, 73, 74, 76, 77, 79, 80, 81, 82, 83, 85, 86, 88, 89, 90, 91, 92, 94, 95, 97, 98, 99, 100, 101, 103