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a(n)=(s(n)+4)/5, where s(n)=n-th base 5 palindrome that starts with 1.
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%I #5 Jul 12 2012 00:39:46

%S 1,2,6,7,8,9,10,26,32,38,44,50,126,131,136,141,146,152,157,162,167,

%T 172,178,183,188,193,198,204,209,214,219,224,230,235,240,245,250,626,

%U 656,686,716,746,752,782,812,842,872,878,908,938

%N a(n)=(s(n)+4)/5, where s(n)=n-th base 5 palindrome that starts with 1.

%K nonn,base

%O 1,2

%A _Clark Kimberling_