A044411 Numbers n such that string 7,9 occurs in the base 10 representation of n but not of n-1.

79, 179, 279, 379, 479, 579, 679, 779, 790, 879, 979, 1079, 1179, 1279, 1379, 1479, 1579, 1679, 1779, 1790, 1879, 1979, 2079, 2179, 2279, 2379, 2479, 2579, 2679, 2779, 2790, 2879, 2979, 3079, 3179, 3279, 3379, 3479, 3579