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 A218414 Numbers k for which sigma(k)/k - 1/9 is an integer. 5
 540, 3276, 58032, 950976, 1862190, 17660160, 3925389312, 1005014679552, 16080326885376, 17908023591648, 43947421401888, 92069057203200, 207726054681600, 411471933675264, 12363050673792000, 160893693946908502272, 269783631952374398976, 467406267507560908800 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(8) > 10^11. - Donovan Johnson, Nov 01 2012 a(8) > 10^12. - Giovanni Resta, Nov 04 2012 Note that there are no terms with abundancy 10/9 (k=1) or 19/9 (k=2). Michel Marcus, Jun 25 2013 LINKS Table of n, a(n) for n=1..18. CROSSREFS Cf. A218430, A160320, A218415, A218416, A160321, A218417, A218418. Sequence in context: A185463 A069474 A253824 * A328133 A146123 A159207 Adjacent sequences: A218411 A218412 A218413 * A218415 A218416 A218417 KEYWORD nonn AUTHOR Zdenek Cervenka, Oct 28 2012 EXTENSIONS a(6)-a(7) from Donovan Johnson, Nov 01 2012 More terms from Michel Marcus, Jun 25 2013 STATUS approved

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Last modified April 23 00:50 EDT 2024. Contains 371906 sequences. (Running on oeis4.)