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A091395 a(n) = Product_{ p | n } (1 + Legendre(-7,p) ). 2
1, 2, 0, 2, 0, 0, 1, 2, 0, 0, 2, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 4, 2, 0, 0, 0, 0, 2, 2, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 4, 0, 4, 0, 0, 1, 0, 0, 0, 2, 0, 0, 2, 0, 4, 0, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 2, 0, 0, 4, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 0, 4, 0, 4, 0, 0, 0, 4, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..1000

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, -7), n=1..120)];

PROG

(PARI) a(n)={my(f=factor(n)[, 1]); prod(i=1, #f, 1 + kronecker(-7, f[i]))} \\ Andrew Howroyd, Jul 23 2018

CROSSREFS

Cf. A091379, A175629.

Sequence in context: A260675 A035147 A101673 * A248107 A035220 A227618

Adjacent sequences:  A091392 A091393 A091394 * A091396 A091397 A091398

KEYWORD

nonn,mult

AUTHOR

N. J. A. Sloane, Mar 02 2004

STATUS

approved

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Last modified April 20 03:36 EDT 2019. Contains 322294 sequences. (Running on oeis4.)