A044791 Numbers n such that string 7,8 occurs in the base 10 representation of n but not of n+1.

78, 178, 278, 378, 478, 578, 678, 778, 789, 878, 978, 1078, 1178, 1278, 1378, 1478, 1578, 1678, 1778, 1789, 1878, 1978, 2078, 2178, 2278, 2378, 2478, 2578, 2678, 2778, 2789, 2878, 2978, 3078, 3178, 3278, 3378, 3478, 3578