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A162826 Positive numbers n such that 2*60*n/(60+n) are integers. 2
12, 15, 20, 30, 36, 40, 60, 84, 90, 100, 120, 140, 165, 180, 228, 240, 300, 340, 390, 420, 540, 660, 740, 840, 1140, 1380, 1740, 2340, 3540, 7140 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..30.

MATHEMATICA

f[a_, b_]:=(a*b)/(a+b)*2; a=60; lst={}; Do[If[f[a, n]==IntegerPart[f[a, n]], AppendTo[lst, n]], {n, 9!}]; lst

Select[Range[8000], IntegerQ[(120#)/(60+#)]&] (* Harvey P. Dale, Mar 19 2019 *)

CROSSREFS

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

Sequence in context: A156683 A050696 A144266 * A162820 A267195 A335859

Adjacent sequences:  A162823 A162824 A162825 * A162827 A162828 A162829

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 September 22 20:23 EDT 2020. Contains 337291 sequences. (Running on oeis4.)