A283843 a(n) = A063776(n) + 1.

3, 3, 5, 5, 9, 13, 21, 33, 61, 105, 189, 345, 633, 1173, 2193, 4097, 7713, 14573, 27597, 52433, 99881, 190653, 364725, 699073, 1342185, 2581113, 4971069, 9586985, 18512793, 35791473, 69273669, 134217729, 260301177, 505290273, 981706833

Offset: 1

Author

N. J. A. Sloane, Mar 28 2017

Keywords

• nonn

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.

Crossrefs

Cf. A063776.

Programs

Mathematica

Table[a=Select[Divisors[n], OddQ[#]&]; 1 + Apply[Plus, 2^(n/a) EulerPhi[a]]/n, {n, 1, 35}] (* Vincenzo Librandi, Mar 29 2017 *)