A162820 Positive numbers n such that 60*n/(60+n) are integers.

12, 15, 20, 30, 40, 60, 84, 90, 120, 140, 165, 180, 240, 300, 340, 390, 540, 660, 840, 1140, 1740, 3540

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. Adams-Watters, Aug 07 2009]

Sequence in context: A050696 A144266 A162826 * A267195 A353702 A335859

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