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A162821
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Positive numbers n such that 30*n/(30-n) are integers.
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The number n=30 is explicitly included, treating the result of division through zero as an integer.
Row 30 of A191973.
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MAPLE
| for m from 1 to 930 do if(m=30 or m*30 mod (m-30) = 0)then printf("%d, ", m): fi: od: # Nathaniel Johnston, Jun 22 2011
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MATHEMATICA
| 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
| Cf. A162688, A162689, A162690, A162691, A162692, A162693, A162694, A162817, A162818, A162819, A162820, A191973.
Sequence in context: A033894 A033649 A050680 * A059324 A112776 A120063
Adjacent sequences: A162818 A162819 A162820 * A162822 A162823 A162824
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KEYWORD
| nonn,fini,full,easy
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Jul 13 2009
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EXTENSIONS
| Keywords fini,full added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 31 2009
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