

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
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..22.


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. AdamsWatters, 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



