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 A096533 #3 Mar 30 2012 18:50:44 %S A096533 0,0,1,1,1,2,2,2,3,4,5,5,5,6,6,6,6,7,8,9,9,9,9,10,10,10,11,12,13,13, %T A096533 13,14,14,15,15,16,17,17,18,18,18,19,19,19,20,20,21,22,22,23,24,24,24, %U A096533 25,25,26,27,27,27,28,28,28,28,29,30,30,31,31,31,31,32,33,33,34,35,36 %N A096533 Number of composite numbers not greater than the n-th composite number that divide at least one other number not greater than the n-th composite number. %C A096533 a(n) = A065855(floor(A002808(n)/2)); %C A096533 A096532(n) + a(n) = n. %K A096533 nonn %O A096533 1,6 %A A096533 _Reinhard Zumkeller_, Jun 23 2004