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

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

Cf. A007774, A024619, A030231, A056760, A064040, A084227, A100658.

Sequence in context: A343311 A348718 A325265 * A064040 A168638 A024619

Adjacent sequences: A105639 A105640 A105641 * A105643 A105644 A105645

Keyword

nonn

Author

Zak Seidov, May 03 2005

Status

approved