Modifications for A069623, added formula

[Brendan McKay]

This is a sequence simply derived from an existing sequence.
Thousands of sequences like this could be added but unless
they have important applications in their own right they
should NOT be added imo.

Brendan.

* David Wilson <davidwwilson at attbi.com> [021012 05:18]:
> %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
>