A043235 - OEIS

%I #8 Aug 23 2021 21:46:03

%S 25,52,125,152,225,250,325,352,425,452,520,552,625,652,725,752,825,

%T 852,925,952,1025,1052,1125,1152,1225,1250,1325,1352,1425,1452,1520,

%U 1552,1625,1652,1725,1752,1825,1852,1925,1952,2025

%N Numbers k such that 2 and 5 occur juxtaposed in the base-10 representation of k but not of k-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_