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1 together with the semiprimes.
2

%I #14 Dec 31 2015 11:07:49

%S 1,4,6,9,10,14,15,21,22,25,26,33,34,35,38,39,46,49,51,55,57,58,62,65,

%T 69,74,77,82,85,86,87,91,93,94,95,106,111,115,118,119,121,122,123,129,

%U 133,134,141,142,143,145,146,155,158,159,161,166,169,177,178,183,185,187

%N 1 together with the semiprimes.

%C The products of two noncomposite numbers that do not contain prime numbers.

%t Join[{1},Select[Range[200],PrimeOmega[#]==2&]] (* _Harvey P. Dale_, Dec 31 2015 *)

%Y Cf. A001358, A037143.

%K nonn

%O 1,2

%A _Juri-Stepan Gerasimov_, Apr 19 2010

%E Definition and comment swapped by _Michel Marcus_, Aug 09 2014