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%I #15 Mar 02 2020 09:21:05
%S 4,8,28,84,242,744,2284,7096,22179,69561,218759,689206,2173942,
%T 6862783,21676671,68493153,216477260,684309327,2163434093,6840212693,
%U 21628140126,68388775913,216252650605,683825838922,2162393136881,6837971108286,21623312527390,68378377967873
%N Number of n-digit perfect powers.
%F a(n) = A070428(n) - A070428(n-1) for n >= 3.
%e a(2) = 8 because there are eight 2-digit perfect powers: 16, 25, 27, 32, 36, 49, 64, 81.
%e a(3) = 28 = A070428(3) - A070428(2) = 41 - 13 (in A070428 offset is 0).
%Y Cf. A001597, A070428.
%K nonn,base,easy
%O 1,1
%A _Zak Seidov_, Oct 11 2002
%E More terms from _Jinyuan Wang_, Mar 02 2020
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