A226915 Fourth column of A226518.

-1, 1, 1, 1, 1, -1, 3, -1, 1, 1, 1, -1, 3, -1, 1, 1, -1, 3, 3, 1, 1, 1, 3, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 3, -1, 1, 1, 3, 3, -1, 1, -1, 1, 1, 1, 1, 3, 3, 1, 1, 3, -1, 1, 1, 1, -1, -1, -1, 3, 3, -1, -1, 3, 1, 1, 1, 3, 1, 1, -1, 3, -1, 1, 1, 3, 1, 1, 3, 3, 1, 1, 1, 3, -1, 1, 1, 3, 1, 1, -1, 3, -1, 1

Offset

3,7

Links

Table of n, a(n) for n=3..98.

Formula

a(n) = 1 + Legendre(2,p) + Legendre(3,p) where p = prime(n).

Crossrefs

Cf. A226518.

Sequence in context: A272334 A014491 A214071 * A180173 A318668 A322361

Adjacent sequences: A226912 A226913 A226914 * A226916 A226917 A226918

Keyword

sign

Author

N. J. A. Sloane, Jun 22 2013

Status

approved