A139179 Number of non-fourth-powers <= n.

0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70

Offset

0,4

Links

Table of n, a(n) for n=0..72.

Formula

a(n) = n - floor[n^(1/4)].

Mathematica

a[n_] := n - Floor[n^(1/4)]; a /@ Range[0, 72] (* Giovanni Resta, Jun 21 2016 *)

Crossrefs

Cf. A028391, A064524.

Sequence in context: A296090 A323372 A295300 * A262437 A130909 A275993

Adjacent sequences: A139176 A139177 A139178 * A139180 A139181 A139182

Keyword

easy,nonn

Author

Jonathan Vos Post, Jun 06 2008

Extensions

Offset corrected by Giovanni Resta, Jun 21 2016

Status

approved