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A162825
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Positive numbers n such that 60*n/(60-n) are integers.
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5
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10, 12, 15, 20, 24, 30, 35, 36, 40, 42, 44, 45, 48, 50, 51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 72, 75, 76, 78, 80, 84, 85, 90, 96, 100, 105, 108, 110, 120, 132, 135, 140, 150, 160, 180, 204, 210, 240, 260, 285, 300, 360, 420
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The number n=60 is explicitly included. The last entry in the sequence is a(68) = 3660.
Row 60 of A191973.
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..68 (full sequence)
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MAPLE
| for n from 1 to 3660 do if(n=60 or type(60*n/(60-n), integer))then printf("%d, ", n): fi: od: # Nathaniel Johnston, Jun 22 2011
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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
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CROSSREFS
| Cf. A162688, A162689, A162690, A162691, A162692, A162693, A162694, A162817, A162818, A162819, A162820, A162821, A162822, A162823, A162824, A191973.
Sequence in context: A054518 A072198 A057485 * A107836 A096128 A063192
Adjacent sequences: A162822 A162823 A162824 * A162826 A162827 A162828
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KEYWORD
| nonn,easy,fini
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Jul 13 2009
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EXTENSIONS
| Keyword fini added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 31 2009
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