%I #5 Mar 30 2012 18:56:42
%S 6,30,56,81,106,131,150,181,206,231,256,280,306,331,356,381,405,431,
%T 456,481,506,530,556,581,606,631,655,681,706,731,750,881,905,931,956,
%U 981,1006,1030,1056,1081,1106,1131,1155,1181,1206
%N Numbers n such that string 1,1 occurs in the base 5 representation of n but not of n-1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_