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a(n)=(s(n)+2)/5, where s(n)=n-th base 5 palindrome that starts with 3.
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%I #5 Jul 12 2012 00:39:46

%S 1,4,16,17,18,19,20,76,82,88,94,100,376,381,386,391,396,402,407,412,

%T 417,422,428,433,438,443,448,454,459,464,469,474,480,485,490,495,500,

%U 1876,1906,1936,1966,1996,2002,2032,2062,2092,2122

%N a(n)=(s(n)+2)/5, where s(n)=n-th base 5 palindrome that starts with 3.

%K nonn,base

%O 1,2

%A _Clark Kimberling_