%I #5 Jul 12 2012 00:39:46
%S 1,4,13,14,15,16,49,54,59,64,193,197,201,205,210,214,218,222,227,231,
%T 235,239,244,248,252,256,769,789,809,829,834,854,874,894,899,919,939,
%U 959,964,984,1004,1024,3073,3089,3105,3121,3141
%N a(n)=(s(n)+1)/4, where s(n)=n-th base 4 palindrome that starts with 3.
%K nonn,base
%O 1,2
%A _Clark Kimberling_