A035229 - OEIS

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A035229

Coefficients in expansion of Dirichlet series Product_p (1-(Kronecker(m,p)+1)*p^(-s) + Kronecker(m,p)*p^(-2s))^(-1) for m = 47.

1, 2, 0, 3, 0, 0, 0, 4, 1, 0, 2, 0, 0, 0, 0, 5, 2, 2, 2, 0, 0, 4, 2, 0, 1, 0, 0, 0, 0, 0, 2, 6, 0, 4, 0, 3, 2, 4, 0, 0, 0, 0, 2, 6, 0, 4, 1, 0, 1, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 4, 0, 7, 0, 0, 2, 6, 0, 0, 0, 4, 0, 4, 0, 6, 0, 0, 0, 0, 1

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OFFSET

1,2

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

From Amiram Eldar, Nov 20 2023: (Start)

a(n) = Sum_{d|n} Kronecker(47, d).

Multiplicative with a(47^e) = 1, a(p^e) = (1+(-1)^e)/2 if Kronecker(47, p) = -1 (p is in A038928), and a(p^e) = e+1 if Kronecker(47, p) = 1 (p is in A038927 \ {47}).

Asymptotic mean: Limit_{m->oo} (1/m) * Sum_{k=1..m} a(k) = 2*log(48+7*sqrt(47))/sqrt(47) = 1.331525560401... . (End)

MATHEMATICA

a[n_] := DivisorSum[n, KroneckerSymbol[47, #] &]; Array[a, 100] (* Amiram Eldar, Nov 20 2023 *)

PROG

(PARI) my(m = 47); direuler(p=2, 101, 1/(1-(kronecker(m, p)*(X-X^2))-X))

(PARI) a(n) = sumdiv(n, d, kronecker(47, d)); \\ Amiram Eldar, Nov 20 2023

CROSSREFS

Cf. A038927, A038928.

Sequence in context: A080024 A348223 A035199 * A348019 A285982 A261727

Adjacent sequences: A035226 A035227 A035228 * A035230 A035231 A035232

KEYWORD

nonn,easy,mult

AUTHOR

N. J. A. Sloane

STATUS

approved