A044773 Numbers n such that string 6,0 occurs in the base 10 representation of n but not of n+1.

60, 160, 260, 360, 460, 560, 609, 660, 760, 860, 960, 1060, 1160, 1260, 1360, 1460, 1560, 1609, 1660, 1760, 1860, 1960, 2060, 2160, 2260, 2360, 2460, 2560, 2609, 2660, 2760, 2860, 2960, 3060, 3160, 3260, 3360, 3460, 3560