A328707 Dirichlet g.f.: Product_{k>=2} (1 + k^(-s)) / (1 - k^(-s)).

1, 2, 2, 4, 2, 6, 2, 8, 4, 6, 2, 14, 2, 6, 6, 14, 2, 14, 2, 14, 6, 6, 2, 30, 4, 6, 8, 14, 2, 22, 2, 24, 6, 6, 6, 36, 2, 6, 6, 30, 2, 22, 2, 14, 14, 6, 2, 58, 4, 14, 6, 14, 2, 30, 6, 30, 6, 6, 2, 58, 2, 6, 14, 40, 6, 22, 2, 14, 6, 22, 2, 82, 2, 6, 14, 14, 6, 22, 2, 58

Offset

1,2

Comments

Dirichlet convolution of A001055 with A045778.

Links

Table of n, a(n) for n=1..80.

Formula

a(n) = Sum_{d|n} A001055(n/d) * A045778(d).

Crossrefs

Cf. A001055, A045778, A328709.

Sequence in context: A278523 A071364 A278237 * A067824 A347458 A107067

Adjacent sequences: A328704 A328705 A328706 * A328708 A328709 A328710

Keyword

nonn

Author

Ilya Gutkovskiy, Oct 26 2019

Status

approved