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 A162829 #5 Apr 09 2014 18:44:51
%S A162829 8,24,30,40,60,72,80,105,120,168,180,200,240,264,280,330,360,456,480,
%T A162829 520,600,680,780,840,1032,1080,1320,1480,1680,1800,2280,2760,3080,
%U A162829 3480,4680,5640,7080,9480,14280,28680
%N A162829 Positive numbers n such that 2*120*n/(120+n) are integers.
%t A162829 f[a_,b_]:=(a*b)/(a+b)*2; a=120;lst={};Do[If[f[a,n]==IntegerPart[f[a,n]], AppendTo[lst,n]],{n,9!}];lst
%t A162829 Select[Range[30000],IntegerQ[240 #/(120+#)]&] (* _Harvey P. Dale_, Apr 09 2014 *)
%Y A162829 Cf. A162688, A162689, A162690, A162691, A162692, A162693, A162694, A162817, A162818, A162819, A162820, A162821, A162822, A162823, A162824, A162825, A162826, A162828
%K A162829 nonn,fini,full
%O A162829 1,1
%A A162829 _Vladimir Joseph Stephan Orlovsky_, Jul 13 2009
%E A162829 Sign in definition flipped by _R. J. Mathar_, Jul 31 2009