OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
Eric Weisstein's World of Mathematics, Abundant Number
FORMULA
a(n) << n log log n with lim sup a(n)/(n log log n) approximately 7.192. - Charles R Greathouse IV, Feb 19 2013
MATHEMATICA
sdan[n_]:=Module[{ds=DivisorSigma[1, n]}, If[ds>2n, ds, 0]]; Select[ Array[ sdan, 300], #>0&] (* Harvey P. Dale, Aug 15 2015 *)
PROG
(PARI) for(n=6, 200, s=sigma(n); if(s>2*n, print1(s", "))) \\ Charles R Greathouse IV, Feb 19 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Jan 22 2012
STATUS
approved