OFFSET
1,2
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..100
MATHEMATICA
abu[x_] := Abs[DivisorSigma[1, x]-2*x] Do[If[ !Greater[abu[n], n^(1/3)//N]&&OddQ[n], Print[n]], {n, 1, 100000}]
PROG
(PARI) isok(n) = (n % 2) && (abs(sigma(n)-2*n) < sqrtn(n, 3)); \\ Michel Marcus, Nov 10 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Oct 20 2003
EXTENSIONS
a(17)-a(28) from Donovan Johnson, Feb 01 2009
STATUS
approved