A166260 a(n) = A089026(n) - 1.

0, 1, 2, 0, 4, 0, 6, 0, 0, 0, 10, 0, 12, 0, 0, 0, 16, 0, 18, 0, 0, 0, 22, 0, 0, 0, 0, 0, 28, 0, 30, 0, 0, 0, 0, 0, 36, 0, 0, 0, 40, 0, 42, 0, 0, 0, 46, 0, 0, 0, 0, 0, 52, 0, 0, 0, 0, 0, 58, 0, 60, 0, 0, 0, 0, 0, 66, 0, 0, 0, 70, 0, 72, 0, 0, 0, 0, 0, 78, 0, 0, 0, 82, 0, 0, 0, 0, 0, 88, 0, 0, 0, 0, 0, 0

Offset: 1

Author

Mats Granvik, Oct 10 2009

Keywords

• nonn

Comments

Same as A061006 except for a(4) = 0 (Wilson's Theorem). - Georg Fischer, Oct 12 2018

Crossrefs

Cf. A010051, A061006, A089026.

Cf. A119690. - R. J. Mathar, Oct 16 2009

Programs

PARI

a(n) = if (isprime(n), n-1, 0); \\ Michel Marcus, Oct 12 2018

Formula

a(n) = (n-1) * A010051(n). - Wesley Ivan Hurt, Oct 12 2018