A043246 Numbers n such that 4 and 5 occur juxtaposed in the base 10 representation of n but not of n-1.

45, 54, 145, 154, 245, 254, 345, 354, 445, 450, 540, 554, 645, 654, 745, 754, 845, 854, 945, 954, 1045, 1054, 1145, 1154, 1245, 1254, 1345, 1354, 1445, 1450, 1540, 1554, 1645, 1654, 1745, 1754, 1845, 1854, 1945, 1954, 2045