A043232 Numbers n such that 1 and 9 occur juxtaposed in the base 10 representation of n but not of n-1.

19, 91, 119, 190, 219, 291, 319, 391, 419, 491, 519, 591, 619, 691, 719, 791, 819, 891, 910, 991, 1019, 1091, 1119, 1190, 1219, 1291, 1319, 1391, 1419, 1491, 1519, 1591, 1619, 1691, 1719, 1791, 1819, 1891, 1900, 2019, 2091