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A162820
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Positive numbers n such that 60*n/(60+n) are integers.
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8
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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
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1,1
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LINKS
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MATHEMATICA
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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
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CROSSREFS
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KEYWORD
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nonn,fini,full
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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