A339701 - OEIS

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A339701

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

8

1, -2, -2, -1, -2, 2, -2, 2, -1, 2, -2, 4, -2, 2, 2, 1, -2, 4, -2, 4, 2, 2, -2, 0, -1, 2, 2, 4, -2, 2, -2, 2, 2, 2, 2, 0, -2, 2, 2, 0, -2, 2, -2, 4, 4, 2, -2, -2, -1, 4, 2, 4, -2, 0, 2, 0, 2, 2, -2, -4, -2, 2, 4, -2, 2, 2, -2, 4, 2, 2, -2, -4, -2, 2, 4, 4, 2, 2, -2, -2

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OFFSET

1,2

LINKS

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

FORMULA

a(1) = 1; a(n) = -Sum_{d|n, d < n} A301830(n/d) * a(d).

a(n) = Sum_{d|n} A114592(n/d) * A114592(d).

a(p^k) = A002107(k) for prime p.

CROSSREFS

Cf. A002107, A114592, A301830, A339702, A339703, A339704, A339705, A339706, A339707.

Sequence in context: A169695 A173642 A234305 * A304094 A259527 A275992

Adjacent sequences: A339698 A339699 A339700 * A339702 A339703 A339704

KEYWORD

sign

AUTHOR

Ilya Gutkovskiy, Dec 13 2020

STATUS

approved