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A339717 Dirichlet g.f.: Product_{k>=2} 1 / (1 + k^(-s))^2. 7
1, -2, -2, 1, -2, 2, -2, -2, 1, 2, -2, 0, -2, 2, 2, 4, -2, 0, -2, 0, 2, 2, -2, 4, 1, 2, -2, 0, -2, 2, -2, -4, 2, 2, 2, 2, -2, 2, 2, 4, -2, 2, -2, 0, 0, 2, -2, -4, 1, 0, 2, 0, -2, 4, 2, 4, 2, 2, -2, 0, -2, 2, 0, 5, 2, 2, -2, 0, 2, 2, -2, -4, -2, 2, 0, 0, 2, 2, -2, -4 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

FORMULA

a(1) = 1; a(n) = -Sum_{d|n, d < n} A328706(n/d) * a(d).

a(n) = Sum_{d|n} A316441(n/d) * A316441(d).

a(p^k) = A022597(k) for prime p.

CROSSREFS

Cf. A022597, A316441, A328706, A339718, A339719, A339720, A339721, A339722.

Sequence in context: A274534 A224030 A233136 * A106054 A275437 A169695

Adjacent sequences:  A339714 A339715 A339716 * A339718 A339719 A339720

KEYWORD

sign

AUTHOR

Ilya Gutkovskiy, Dec 14 2020

STATUS

approved

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Last modified July 30 04:51 EDT 2021. Contains 346348 sequences. (Running on oeis4.)