%I #5 Mar 30 2012 18:56:45
%S 23,87,151,191,215,279,343,407,471,535,599,663,703,727,791,855,919,
%T 983,1047,1111,1175,1215,1239,1303,1367,1431,1535,1559,1623,1687,1727,
%U 1751,1815,1879,1943,2007,2071,2135,2199,2239,2263
%N Numbers n such that string 2,7 occurs in the base 8 representation of n but not of n+1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_