OFFSET
1,1
COMMENTS
The abundant-index-of-abundant numbers, or "meta-abundant" numbers.
Subset of A005101.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
MATHEMATICA
abQ[n_] := DivisorSigma[1, n] > 2 n; s = {}; c = 0; Do[If[abQ[n], c++; If[abQ[c], AppendTo[s, n]]], {n, 1, 1000}]; s (* Amiram Eldar, Jun 21 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Kevin L. Schwartz and Christian N. K. Anderson, Mar 23 2013
STATUS
approved