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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
OFFSET
1,1
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
KEYWORD
nonn,fini,full
AUTHOR
EXTENSIONS
Keywords fini,full added by R. J. Mathar, Jul 31 2009
STATUS
approved