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%I #8 Oct 19 2013 06:36:17
%S 1,21,241,2463,24671,246745,2467401,24674017,246740209,2467401073,
%T 24674011069,246740110021,2467401100859,24674011004865,
%U 246740110026451,2467401100272455,24674011002722867,246740110027242491,2467401100272345957
%N a(n) = (10^n)-th odd squarefree number.
%F a(n) ~ (pi/2)^2 * 10^n + O(10^(n/2)). This follows from the formula given in A056911: A056911(n) ~ n * (3/2) * zeta(2) + O(n^(1/2)) = n * (3/2) * (pi^2 / 6) + O(n^(1/2)). - _M. F. Hasler_
%Y Cf. A056911.
%K nonn
%O 0,2
%A _Zak Seidov_, Sep 24 2010
%E a(10)-a(18) from _Max Alekseyev_, Sep 24 2010
%E Edited by _N. J. A. Sloane_, Sep 24 2010
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