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 A046340 #17 Jun 18 2024 17:51:03 %S A046340 27,45,63,75,99,105,117,125,147,153,165,171,175,195,207,231,243,245, %T A046340 255,261,273,275,279,285,325,333,343,345,357,363,369,385,387,399,405, %U A046340 423,425,429,435,455,465,475,477,483,507,531,539,549,555,561,567,575 %N A046340 Odd composite numbers with an odd number of prime factors (counted with multiplicity). %H A046340 John Cerkan, <a href="/A046340/b046340.txt">Table of n, a(n) for n = 1..10000</a> %t A046340 Select[Range[3,699,2],OddQ[Total[Transpose[FactorInteger[#]][[2]]]] && !PrimeQ[#]&] (* _Harvey P. Dale_, Dec 09 2010 *) %t A046340 Select[Range[3,699,2],CompositeQ[#]&&OddQ[PrimeOmega[#]]&] (* _Harvey P. Dale_, Jun 18 2024 *) %Y A046340 Cf. A046339, A046341. %K A046340 nonn %O A046340 1,1 %A A046340 _Patrick De Geest_, Jun 15 1998 %E A046340 Name (description) modified by _Harvey P. Dale_, Dec 09 2010