A044374 Numbers n such that string 4,2 occurs in the base 10 representation of n but not of n-1.

42, 142, 242, 342, 420, 442, 542, 642, 742, 842, 942, 1042, 1142, 1242, 1342, 1420, 1442, 1542, 1642, 1742, 1842, 1942, 2042, 2142, 2242, 2342, 2420, 2442, 2542, 2642, 2742, 2842, 2942, 3042, 3142, 3242, 3342, 3420, 3442