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

%S 21,102,183,189,264,345,426,507,588,669,750,831,912,918,993,1074,1155,

%T 1236,1317,1398,1479,1560,1641,1647,1701,1803,1884,1965,2046,2127,

%U 2208,2289,2370,2376,2451,2532,2613,2694,2775,2856

%N Numbers n such that string 2,3 occurs in the base 9 representation of n but not of n-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_