A034737 Dirichlet convolution of b_n=2^(n-1) with sigma(n).

1, 5, 8, 21, 22, 64, 72, 181, 285, 590, 1036, 2256, 4110, 8424, 16496, 33269, 65554, 132081, 262164, 526062, 1048896, 2100284, 4194328, 8395760, 16777343, 33566790, 67109980, 134242920, 268435486, 536922688, 1073741856, 2147583093

Offset

1,2

Links

Table of n, a(n) for n=1..32.

Formula

a(n) ~ 2^(n-1). - Vaclav Kotesovec, Sep 11 2019

Mathematica

Table[Sum[DivisorSigma[1, n/d]*2^(d - 1), {d, Divisors[n]}], {n, 1, 40}] (* Vaclav Kotesovec, Sep 10 2019 *)

Crossrefs

Sequence in context: A271693 A271281 A246330 * A271156 A272115 A268195

Adjacent sequences: A034734 A034735 A034736 * A034738 A034739 A034740

Keyword

nonn

Author

Erich Friedman

Status

approved