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 A184729 #5 Mar 30 2012 17:25:56 %S A184729 0,0,4,1,1,1,10,1,12,1,16,11,8,1,4,1,1,1,1,28,9,1,1,8,1,12,1,42,17,1, %T A184729 1,46,31,7,1,1,28,39,39,60,11,13,25,66,1,70,47,47,72,1,38,1,1,26,1,7, %U A184729 88,1,1,61,20,17,100,67,67,102,29,41,106 %N A184729 a(n) = A184728(n)/A130533(n) unless A130533(n) = 0 in which case a(n) = 0. %C A184729 a(n) is the "level" of semiprimes. %C A184729 The decomposition of semiprimes into weight * level + gap is A001358(n) = A130533(n) * a(n) + A065516(n) if a(n) > 0. %C A184729 A184728(n) = A001358(n) - A065516(n) if A001358(n) - A065516(n) > A065516(n), 0 otherwise. %H A184729 Rémi Eismann, <a href="/A184729/b184729.txt">Table of n, a(n) for n = 1..10000</a> %e A184729 For n = 1 we have A130533(1) = 0, hence a(1) = 0. %e A184729 For n = 3 we have A184728(3)/A130533(3)= 8 / 2 = 4; hence a(3) = 4. %e A184729 For n = 20 we have A184728(20)/A130533(20)= 56 / 2 = 28; hence a(20) = 28. %Y A184729 Cf. A001358, A065516, A130533, A184728, A117078, A117563, A001223, A118534. %K A184729 nonn %O A184729 1,3 %A A184729 _Rémi Eismann_, Jan 20 2011