OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..3333
Juhani Karhumäki, S. Puzynina, M. Rao, M. A. Whiteland, On cardinalities of k-abelian equivalence classes, arXiv preprint arXiv:1605.03319 [math.CO], 2016.
MATHEMATICA
Table[a=Select[Divisors[n], OddQ[#]&]; 1 + Apply[Plus, 2^(n/a) EulerPhi[a]]/n, {n, 1, 35}] (* Vincenzo Librandi, Mar 29 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 28 2017
STATUS
approved