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A162829 Positive numbers n such that 2*120*n/(120+n) are integers. 0
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 (list; graph; refs; listen; history; text; internal format)
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: A212861 A038524 A261394 * A175368 A000118 A096727

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

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Last modified April 25 10:11 EDT 2017. Contains 285379 sequences.