A043956 Numbers n such that 4 and 7 occur juxtaposed in the base 8 representation of n but not of n+1.

39, 60, 103, 124, 167, 188, 231, 252, 295, 319, 359, 380, 423, 444, 487, 508, 551, 572, 615, 636, 679, 700, 743, 764, 807, 831, 871, 892, 935, 956, 999, 1020, 1063, 1084, 1127, 1148, 1191, 1212, 1255, 1276, 1319, 1343, 1383