A039031 Numbers n such that representation in base 7 has same number of 0's and 2's.

1, 3, 4, 5, 6, 8, 10, 11, 12, 13, 14, 22, 24, 25, 26, 27, 29, 31, 32, 33, 34, 36, 38, 39, 40, 41, 43, 45, 46, 47, 48, 51, 57, 59, 60, 61, 62, 63, 71, 73, 74, 75, 76, 78, 80, 81, 82, 83, 85, 87, 88, 89, 90, 92, 94, 95, 96, 97, 99, 101, 102, 103, 104, 105, 119, 126, 133, 140