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Numbers n such that string 1,1 occurs in the base 5 representation of n but not of n-1.
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%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_