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A273016
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Ramanujan's largely composite numbers having 5 as the greatest prime divisor.
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5
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10, 20, 30, 60, 90, 120, 180, 240, 360, 480, 540, 600, 720, 1080, 1440, 2160, 4320
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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By the theorem in comment in A273015, the sequence is finite.
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LINKS
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Table of n, a(n) for n=1..17.
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MATHEMATICA
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a = {}; b = {0}; Do[If[# >= Max@ b, AppendTo[a, k] && AppendTo[b, #]] &@ DivisorSigma[0, k], {k, 10^7}]; Select[a, FactorInteger[#][[-1, 1]] == 5 &] (* Michael De Vlieger, May 13 2016 *)
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CROSSREFS
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Cf. A067128, A273015.
Sequence in context: A127993 A135557 A093037 * A269238 A279420 A274051
Adjacent sequences: A273013 A273014 A273015 * A273017 A273018 A273019
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KEYWORD
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nonn,fini,full
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AUTHOR
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Vladimir Shevelev and Peter J. C. Moses, May 13 2016
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STATUS
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approved
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