A043235 Numbers n such that 2 and 5 occur juxtaposed in the base 10 representation of n but not of n-1.

25, 52, 125, 152, 225, 250, 325, 352, 425, 452, 520, 552, 625, 652, 725, 752, 825, 852, 925, 952, 1025, 1052, 1125, 1152, 1225, 1250, 1325, 1352, 1425, 1452, 1520, 1552, 1625, 1652, 1725, 1752, 1825, 1852, 1925, 1952, 2025