%I #5 Mar 30 2012 18:56:44
%S 52,152,252,352,452,520,552,652,752,852,952,1052,1152,1252,1352,1452,
%T 1520,1552,1652,1752,1852,1952,2052,2152,2252,2352,2452,2520,2552,
%U 2652,2752,2852,2952,3052,3152,3252,3352,3452,3520
%N Numbers n such that string 5,2 occurs in the base 10 representation of n but not of n-1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_