A092152 Sign of A092673(n).

1, -1, -1, 1, -1, 1, -1, 0, 0, 1, -1, -1, -1, 1, 1, 0, -1, 0, -1, -1, 1, 1, -1, 0, 0, 1, 0, -1, -1, -1, -1, 0, 1, 1, 1, 0, -1, 1, 1, 0, -1, -1, -1, -1, 0, 1, -1, 0, 0, 0, 1, -1, -1, 0, 1, 0, 1, 1, -1, 1, -1, 1, 0, 0, 1, -1, -1, -1, 1, -1, -1, 0, -1, 1, 0, -1, 1, -1, -1, 0, 0, 1, -1, 1, 1, 1, 1, 0, -1, 0, 1, -1, 1, 1, 1, 0, -1, 0, 0, 0, -1, -1, -1, 0, -1, 1

Offset: 1

Author

Jon Perry, Mar 31 2004

Keywords

• sign
• mult

Comments

Multiplicative because A092673 is. - Andrew Howroyd, Jul 27 2018

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A092673.

Programs

PARI

a(n)=sign(moebius(n) - if(n%2, 0, moebius(n/2))) \\ Andrew Howroyd, Jul 27 2018

Formula

a(2*n) = sign(mu(2*n) - mu(n)); a(2*n + 1) = mu(2*n + 1). - Andrew Howroyd, Jul 27 2018