Modifications for A069623, added formula

[David Wilson]

%I A069623
%S A069623
1,1,1,2,2,2,2,3,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,6,6,7,7,7,7,7,8,8,8,8,9,
%T A069623
9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
%U A069623
11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12
%N A069623 Number of perfect powers <= n.
%F A069623 a(n) = n - SUM(k = 2 to [log2(n)], mu(k) [n^(1/e)-1]), where mu =
A008683
%Y A069623 Perfect powers are A001597