A034771 Dirichlet convolution of d(n) (# of divisors) with b_n=2^(n-1).

1, 4, 6, 15, 18, 48, 66, 154, 267, 552, 1026, 2154, 4098, 8328, 16428, 33061, 65538, 131676, 262146, 525390, 1048716, 2099208, 4194306, 8393124, 16777251, 33562632, 67109392, 134234334, 268435458, 536904864, 1073741826, 2147549616

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[0, n/d]*2^(d - 1), {d, Divisors[n]}], {n, 1, 30}] (* Vaclav Kotesovec, Sep 10 2019 *)

Crossrefs

Sequence in context: A349157 A117883 A106387 * A294457 A266883 A034764

Adjacent sequences: A034768 A034769 A034770 * A034772 A034773 A034774

Keyword

nonn

Author

Erich Friedman

Status

approved