A044038 Numbers n such that 7 and 8 occur juxtaposed in the base 10 representation of n but not of n+1.

78, 87, 178, 187, 278, 287, 378, 387, 478, 487, 578, 587, 678, 687, 778, 789, 879, 887, 978, 987, 1078, 1087, 1178, 1187, 1278, 1287, 1378, 1387, 1478, 1487, 1578, 1587, 1678, 1687, 1778, 1789, 1879, 1887, 1978, 1987, 2078