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A074591 If n is a prime power then 0 else n. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 14 17:40 EST 2019. Contains 329979 sequences. (Running on oeis4.)