A162829 Positive numbers n such that 2*120*n/(120+n) are integers.

8, 24, 30, 40, 60, 72, 80, 105, 120, 168, 180, 200, 240, 264, 280, 330, 360, 456, 480, 520, 600, 680, 780, 840, 1032, 1080, 1320, 1480, 1680, 1800, 2280, 2760, 3080, 3480, 4680, 5640, 7080, 9480, 14280, 28680

Offset

1,1

Links

Table of n, a(n) for n=1..40.

Mathematica

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
Select[Range[30000], IntegerQ[240 #/(120+#)]&] (* Harvey P. Dale, Apr 09 2014 *)

Crossrefs

Cf. A162688, A162689, A162690, A162691, A162692, A162693, A162694, A162817, A162818, A162819, A162820, A162821, A162822, A162823, A162824, A162825, A162826, A162828

Sequence in context: A333961 A038524 A261394 * A303796 A175368 A000118

Adjacent sequences: A162826 A162827 A162828 * A162830 A162831 A162832

Keyword

nonn,fini,full

Author

Vladimir Joseph Stephan Orlovsky, Jul 13 2009

Extensions

Sign in definition flipped by R. J. Mathar, Jul 31 2009

Status

approved