A105642 - OEIS

A105642

Composite nonsquares and noncubes.

6, 10, 12, 14, 15, 18, 20, 21, 22, 24, 26, 28, 30, 32, 33, 34, 35, 38, 39, 40, 42, 44, 45, 46, 48, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 102, 104, 105, 106, 108

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..68.

FORMULA

a(n) = n + O(n/log n). - Charles R Greathouse IV, Oct 19 2015

MATHEMATICA

nn=200; Complement[Range[nn], Prime[Range[PrimePi[nn]]], Range[Sqrt[nn]]^2, Range[nn^(1/3)]^3] (* Harvey P. Dale, Jan 26 2011 *)

PROG

(PARI) is(n)=n>1 && !isprime(n) && !issquare(n) && !ispower(n, 3) \\ Charles R Greathouse IV, Oct 19 2015

CROSSREFS