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a(n)=(s(n)+3)/10, where s(n)=n-th base 10 palindrome that starts with 7.
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%I #5 Jul 12 2012 00:39:47

%S 1,8,71,72,73,74,75,76,77,78,79,80,701,712,723,734,745,756,767,778,

%T 789,800,7001,7011,7021,7031,7041,7051,7061,7071,7081,7091,7102,7112,

%U 7122,7132,7142,7152,7162,7172,7182,7192,7203,7213

%N a(n)=(s(n)+3)/10, where s(n)=n-th base 10 palindrome that starts with 7.

%K nonn,base

%O 1,2

%A _Clark Kimberling_