A043481 Numbers n such that number of 7's in base 9 is 1.

7, 16, 25, 34, 43, 52, 61, 63, 64, 65, 66, 67, 68, 69, 71, 79, 88, 97, 106, 115, 124, 133, 142, 144, 145, 146, 147, 148, 149, 150, 152, 160, 169, 178, 187, 196, 205, 214, 223, 225, 226, 227, 228, 229, 230, 231, 233, 241, 250, 259