A039178 Numbers n such that representation in base 11 has same number of 2's and 7's.

0, 1, 3, 4, 5, 6, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 29, 33, 34, 36, 37, 38, 39, 41, 42, 43, 44, 45, 47, 48, 49, 50, 52, 53, 54, 55, 56, 58, 59, 60, 61, 63, 64, 65, 66, 67, 69, 70, 71, 72, 74, 75, 76, 79, 88, 89, 91, 92, 93, 94, 96, 97, 98, 99, 100, 102, 103