%I #5 Mar 30 2012 18:56:43

%S 18,99,162,180,261,342,423,504,585,666,747,828,891,909,990,1071,1152,

%T 1233,1314,1395,1458,1557,1620,1638,1719,1800,1881,1962,2043,2124,

%U 2205,2286,2349,2367,2448,2529,2610,2691,2772,2853

%N Numbers n such that string 2,0 occurs in the base 9 representation of n but not of n-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_