A043099 Numbers n such that 1 and 2 occur juxtaposed in the base 3 representation of n but not of n-1.

5, 7, 14, 21, 25, 32, 34, 41, 59, 61, 63, 75, 79, 86, 88, 95, 102, 106, 113, 115, 122, 167, 169, 176, 183, 187, 189, 221, 223, 225, 237, 241, 248, 250, 257, 264, 268, 275, 277, 284, 302, 304, 306, 318, 322, 329, 331, 338, 345, 349