%I #5 Jul 12 2012 00:39:46
%S 1,3,15,16,17,18,19,20,21,99,107,115,123,131,139,147,687,694,701,708,
%T 715,722,729,737,744,751,758,765,772,779,787,794,801,808,815,822,829,
%U 837,844,851,858,865,872,879,887,894,901,908
%N a(n)=(s(n)+5)/7, where s(n)=n-th base 7 palindrome that starts with 2.
%K nonn,base
%O 1,2
%A _Clark Kimberling_