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Search: id:A162821
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| A162821 |
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Positive numbers n such that 30*n/(30-n) are integers. |
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+0
8
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| 5, 10, 12, 15, 18, 20, 21, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 39, 40, 42, 45, 48, 50, 55, 60, 66, 75, 80, 90, 105, 120, 130, 180, 210, 255, 330, 480, 930
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The number n=30 is explicitly included, treating the result of division through zero as an integer.
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MATHEMATICA
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f[a_, b_]:=(a*b)/(a-b); a=30; 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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Cf. A162688, A162689, A162690, A162691, A162692, A162693, A162694, A162817, A162818, A162819, A162820
Sequence in context: A033649 A050680 A098670 this_sequence A059324 A112776 A120063
Adjacent sequences: A162818 A162819 A162820 this_sequence A162822 A162823 A162824
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KEYWORD
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nonn,fini,full
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Jul 13 2009
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EXTENSIONS
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Keywords fini,full added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 31 2009
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