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 A162821 Positive numbers k such that 30*k/(30-k) are integers. 8
 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; text; internal format)
 OFFSET 1,1 COMMENTS The number k=30 is explicitly included, treating the result of division through zero as an integer. Row 30 of A191973. LINKS 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 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 CROSSREFS Cf. A162688, A162689, A162690, A162691, A162692, A162693, A162694, A162817, A162818, A162819, A162820, A191973. Sequence in context: A050680 A293726 A313359 * A313360 A313361 A059324 Adjacent sequences:  A162818 A162819 A162820 * A162822 A162823 A162824 KEYWORD nonn,fini,full,easy AUTHOR Vladimir Joseph Stephan Orlovsky, Jul 13 2009 EXTENSIONS Keywords fini,full added by R. J. Mathar, Jul 31 2009 STATUS approved

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Last modified February 19 09:57 EST 2020. Contains 332041 sequences. (Running on oeis4.)