A239289 - OEIS

%I #13 Jun 16 2014 01:57:42

%S 1,2,3,4,5,6,7,9,10,11,13,14,15,16,17,19,21,22,23,24,25,26,29,31,32,

%T 33,34,35,36,37,38,39,40,41,43,46,47,48,49,51,53,54,55,56,57,58,59,60,

%U 61,62,64,65,67,69,71,72,73,74,77,79,80,81,82,83,84,85,86,87

%N Numbers that are not the product of three (not necessarily distinct) primes.

%C Complement of A014612.

%H Vincenzo Librandi, <a href="/A239289/b239289.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[130], ! PrimeOmega[#]==3 &]

%Y Cf. A014612.

%K nonn,easy

%O 1,2

%A _Vincenzo Librandi_, Jun 14 2014