%I #5 Mar 30 2012 18:56:41
%S 12,28,44,48,60,76,92,108,112,124,140,156,172,176,188,192,220,236,240,
%T 252,268,284,300,304,316,332,348,364,368,380,396,412,428,432,444,448,
%U 476,492,496,508,524,540,556,560,572,588,604
%N Numbers n such that string 3,0 occurs in the base 4 representation of n but not of n-1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_