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A091393 a(n) = Product_{ p | n } (1 + Legendre(-3,p) ). 3
1, 0, 1, 0, 0, 0, 2, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

MAPLE

with(numtheory); L := proc(n, N) local i, t1, t2; t1 := ifactors(n)[2]; t2 := mul((1+legendre(N, t1[i][1])), i=1..nops(t1)); end; [seq(L(n, -3), n=1..120)];

PROG

(PARI)

vecproduct(v) = { my(m=1); for(i=1, #v, m *= v[i]); m; };

A091393(n) = vecproduct(apply(p -> (1 + kronecker(-3, p)), factorint(n)[, 1])); \\ Antti Karttunen, Nov 18 2017

CROSSREFS

Cf. A049347, A091379.

Sequence in context: A279210 A232243 A034876 * A284557 A182032 A265245

Adjacent sequences:  A091390 A091391 A091392 * A091394 A091395 A091396

KEYWORD

nonn,mult

AUTHOR

N. J. A. Sloane, Mar 02 2004

STATUS

approved

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Last modified October 17 15:01 EDT 2019. Contains 328116 sequences. (Running on oeis4.)