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A174572 Highly abundant odd numbers: odd n such that sigma(n) is a record. 4
1, 3, 5, 7, 9, 13, 15, 21, 27, 33, 39, 45, 57, 63, 75, 93, 99, 105, 135, 165, 189, 195, 225, 255, 273, 285, 315, 399, 405, 441, 465, 495, 525, 585, 675, 693, 735, 765, 819, 825, 855, 945, 1125, 1155, 1305, 1365, 1485, 1575, 1755, 1785, 1995, 2145, 2205 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

MATHEMATICA

mx=0; t={}; Do[ds=DivisorSigma[1, n]; If[ds>mx, mx=ds; AppendTo[t, n]], {n, 1, 10^4, 2}]; t

CROSSREFS

Cf. A002093 (highly abundant numbers).

Sequence in context: A003543 A114513 A191186 * A218584 A191182 A177855

Adjacent sequences:  A174569 A174570 A174571 * A174573 A174574 A174575

KEYWORD

nonn

AUTHOR

T. D. Noe, Mar 24 2010

STATUS

approved

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Last modified April 14 04:20 EDT 2021. Contains 342941 sequences. (Running on oeis4.)