A111405 a(n) = f(f(n+1)) - f(f(n)), where f(0) = 0 and f(m) = bigomega(m) = A001222(m) for m > 0.

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

Offset: 0

Author

N. J. A. Sloane, Nov 12 2005

Keywords

• sign

Links

• Antti Karttunen, Table of n, a(n) for n = 0..20000

Crossrefs

Cf. A001222, A111407.

Programs

PARI

f(n) = if(n==0,0,bigomega(n));
A111405(n) = f(f(n+1)) - f(f(n)); \\ Antti Karttunen, Oct 07 2017

Extensions

Description clarified by Antti Karttunen, Oct 07 2017