A044076 - OEIS

%I #5 Mar 30 2012 18:56:42

%S 15,31,47,60,79,95,111,124,143,159,175,188,207,223,239,271,287,303,

%T 316,335,351,367,380,399,415,431,444,463,479,495,527,543,559,572,591,

%U 607,623,636,655,671,687,700,719,735,751,783,799

%N Numbers n such that string 3,3 occurs in the base 4 representation of n but not of n-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_