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%I #10 May 19 2023 15:20:42
%S 1,2,3,5,9,27,81,163,3451,7372,82177,3716,2769544,25899347,357567610,
%T 4229297109
%N a(n) is the index of the first occurrence of n in A278116.
%C a(18) = 42945966786, but a(17) > 5*10^10.
%H R. B. Eggleton, J. S. Kimberley and J. A. MacDougall, <a href="http://hdl.handle.net/1959.13/1441260">Square-free rank of integers</a>, Journal of Combinatorial Mathematics and Combinatorial Computing Vol. 106, Issue August 2018, p. 185-207.
%Y Cf. A278106, A278116.
%K nonn,hard,more
%O 1,2
%A _Jason Kimberley_, Feb 15 2017
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