%I

%S 18,67,116,132,165,214,263,312,361,410,459,475,508,557,606,655,704,

%T 753,802,818,851,930,949,998,1047,1096,1145,1161,1194,1243,1292,1341,

%U 1390,1439,1488,1504,1537,1586,1635,1684,1733,1782

%N Numbers n such that string 2,4 occurs in the base 7 representation of n but not of n+1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_