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a(18) = 42945966786, but a(17) > 5*10^10.
R. B. Eggleton, J. S. Kimberley and J. A. MacDougall, Square-free rank of integers, submitted.
Table of n, a(n) for n=1..16.
Sequence in context: A287915 A105180 A094206 * A118998 A276410 A003432
Adjacent sequences: A278116 A278117 A278118 * A278120 A278121 A278122
Jason Kimberley, Feb 15 2017