This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A168645 #7 Jun 19 2016 03:10:26
%S A168645 4,6,8,9,10,12,14,15,18,20,21,22,25,26,27,28,30,33,34,35,38,39,42,44,
%T A168645 45,46,49,50,51,52,55,57,58,62,63,65,66,68,69,70,74,75,76,77,78,82,85,
%U A168645 86,87,91,92,93,94,95,98,99,102,105,106,110,111,114,115,116,117,118,119
%N A168645 Numbers with 2 or 3 prime divisors (counted with multiplicity).
%C A168645 Below 32 this sequence and A063989 are identical.
%t A168645 Select[Range[150],MemberQ[{2,3},Total[Transpose[ FactorInteger[#]] [[2]]]]&] (* _Harvey P. Dale_, Mar 28 2011 *)
%o A168645 (PARI) is(n)=my(t=bigomega(n)); t==2 || t==3 \\ _Charles R Greathouse IV_, Jun 19 2016
%Y A168645 Cf. A001222, A063989.
%K A168645 nonn
%O A168645 1,1
%A A168645 _Juri-Stepan Gerasimov_, Dec 01 2009