A067460 a(n) = mu(prime(n)-1)+1.

2, 0, 1, 2, 2, 1, 1, 1, 2, 1, 0, 1, 1, 0, 2, 1, 2, 1, 0, 0, 1, 0, 2, 1, 1, 1, 0, 2, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 2, 1, 2, 1, 0, 1, 1, 1, 2, 0, 2, 1, 1, 0, 1, 1, 1, 2, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 2, 1, 2, 1, 1, 2, 0, 1, 1, 2, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 2, 2, 2, 1, 1, 0, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Formula

a(n) = A089451(n)+1. - R. J. Mathar, Jul 21 2017

Mathematica

a[n_] := MoebiusMu[Prime[n]-1] + 1; Array[a, 100] (* Amiram Eldar, Apr 23 2025 *)

Prog

(PARI) a(n) = moebius(prime(n)-1) + 1; \\ Amiram Eldar, Apr 23 2025

Crossrefs

Cf. A008683, A089451.

Sequence in context: A145462 A159934 A229204 * A159855 A128256 A279009

Adjacent sequences: A067457 A067458 A067459 * A067461 A067462 A067463

Keyword

easy,nonn

Author

Benoit Cloitre, Feb 23 2002

Status

approved