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 A162820 Positive numbers n such that 60*n/(60+n) are integers. 8
 12, 15, 20, 30, 40, 60, 84, 90, 120, 140, 165, 180, 240, 300, 340, 390, 540, 660, 840, 1140, 1740, 3540 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA f[a_, b_]:=(a*b)/(a+b); a=60; lst={}; Do[If[f[a, n]==IntegerPart[f[a, n]], AppendTo[lst, n]], {n, 9!}]; lst CROSSREFS Cf. A162688, A162689, A162690, A162691, A162692, A162693, A162694, A162817, A162818, A162819 Cf. A127730. [From Franklin T. Adams-Watters, Aug 07 2009] Sequence in context: A050696 A144266 A162826 * A267195 A335859 A259040 Adjacent sequences:  A162817 A162818 A162819 * A162821 A162822 A162823 KEYWORD nonn,fini,full AUTHOR Vladimir Joseph Stephan Orlovsky, Jul 13 2009 EXTENSIONS Keywords fini,full added by R. J. Mathar, Jul 31 2009 STATUS approved

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Last modified September 22 21:07 EDT 2020. Contains 337291 sequences. (Running on oeis4.)