A044406 Numbers n such that string 7,4 occurs in the base 10 representation of n but not of n-1.

74, 174, 274, 374, 474, 574, 674, 740, 774, 874, 974, 1074, 1174, 1274, 1374, 1474, 1574, 1674, 1740, 1774, 1874, 1974, 2074, 2174, 2274, 2374, 2474, 2574, 2674, 2740, 2774, 2874, 2974, 3074, 3174, 3274, 3374, 3474, 3574