A043950 Numbers n such that 3 and 4 occur juxtaposed in the base 8 representation of n but not of n+1.

28, 35, 92, 99, 156, 163, 220, 231, 287, 291, 348, 355, 412, 419, 476, 483, 540, 547, 604, 611, 668, 675, 732, 743, 799, 803, 860, 867, 924, 931, 988, 995, 1052, 1059, 1116, 1123, 1180, 1187, 1244, 1255, 1311, 1315, 1372, 1379