%I #7 Apr 30 2022 21:25:33
%S 1,3,7,8,9,19,23,27,55,58,61,65,68,71,75,78,81,163,175,187,191,203,
%T 215,219,231,243,487,496,505,517,526,535,547,556,565,569,578,587,599,
%U 608,617,629,638,647,651,660,669,681,690,699,711
%N a(n) = (s(n)+1)/3, where s(n) = n-th base 3 palindrome that starts with 2.
%K nonn,base
%O 1,2
%A _Clark Kimberling_