A074591 If n is a prime power then 0 else n.

0, 0, 0, 0, 0, 6, 0, 0, 0, 10, 0, 12, 0, 14, 15, 0, 0, 18, 0, 20, 21, 22, 0, 24, 0, 26, 0, 28, 0, 30, 0, 0, 33, 34, 35, 36, 0, 38, 39, 40, 0, 42, 0, 44, 45, 46, 0, 48, 0, 50, 51, 52, 0, 54, 55, 56, 57, 58, 0, 60, 0, 62, 63, 0, 65, 66, 0, 68, 69, 70, 0, 72, 0, 74, 75, 76, 77, 78, 0, 80, 0

Offset

1,6

Links

Antti Karttunen, Table of n, a(n) for n = 1..65537

Formula

a(n) = n*(1 - A010055(n)).

Mathematica

Table[If[Length[FactorInteger[n]]==1, 0, n], {n, 100}] (* Harvey P. Dale, Feb 14 2016 *)

Prog

(PARI) A074591(n) = if(omega(n)<=1, 0, n); \\ Antti Karttunen, Aug 06 2018

Crossrefs

Cf. A000961, A010055, A024619, A305976.

Sequence in context: A173066 A173452 A282212 * A318877 A035321 A028720

Adjacent sequences: A074588 A074589 A074590 * A074592 A074593 A074594

Keyword

nonn

Author

Reinhard Zumkeller, Aug 25 2002

Status

approved