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

%S 1,6,36,37,38,39,40,41,42,246,254,262,270,278,286,294,1716,1723,1730,

%T 1737,1744,1751,1758,1766,1773,1780,1787,1794,1801,1808,1816,1823,

%U 1830,1837,1844,1851,1858,1866,1873,1880,1887,1894

%N a(n)=(s(n)+2)/7, where s(n)=n-th base 7 palindrome that starts with 5.

%K nonn,base

%O 1,2

%A _Clark Kimberling_