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a(n)=(s(n)+2)/9, where s(n)=n-th base 9 palindrome that starts with 7.
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%I #5 Jul 12 2012 00:39:47

%S 1,8,64,65,66,67,68,69,70,71,72,568,578,588,598,608,618,628,638,648,

%T 5104,5113,5122,5131,5140,5149,5158,5167,5176,5186,5195,5204,5213,

%U 5222,5231,5240,5249,5258,5268,5277,5286,5295,5304,5313

%N a(n)=(s(n)+2)/9, where s(n)=n-th base 9 palindrome that starts with 7.

%K nonn,base

%O 1,2

%A _Clark Kimberling_