A044351 Numbers n such that string 1,9 occurs in the base 10 representation of n but not of n-1.

19, 119, 190, 219, 319, 419, 519, 619, 719, 819, 919, 1019, 1119, 1190, 1219, 1319, 1419, 1519, 1619, 1719, 1819, 1900, 2019, 2119, 2190, 2219, 2319, 2419, 2519, 2619, 2719, 2819, 2919, 3019, 3119, 3190, 3219, 3319, 3419