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A330323
a(n) = Moebius(n)*Moebius(n+1).
2
-1, 1, 0, 0, -1, -1, 0, 0, 0, -1, 0, 0, -1, 1, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, -1, 1, 0, 0, 1, 1, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, -1, 0, 0, 0, -1, 1, 0, 0, -1, 1, 0, 0, -1, 0, 0, 0, -1, 1, 0, 0, 0, -1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0
OFFSET
1
LINKS
FORMULA
a(n) = A008683(n * (n+1)). - Christian Krause, Apr 17 2021
MATHEMATICA
Table[MoebiusMu[n] MoebiusMu[n + 1], {n, 100}] (* Wesley Ivan Hurt, Apr 19 2021 *)
PROG
(PARI) a(n) = moebius(n*(n+1)); \\ Michel Marcus, Apr 19 2021
CROSSREFS
Cf. A002378, A008683 (Moebius function), A330324.
Cf. A007674 (positions of nonzero terms).
Sequence in context: A214284 A361466 A191747 * A280933 A133081 A352573
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Dec 12 2019
STATUS
approved