OFFSET
1,7
COMMENTS
After a(2)=-1, the next negative value is a(8511)=-1.
Observation: It seems that Sum_{k=1..n} a(k) is usually close to n*log(n)*log(log(n)). Is Sum_{k=1..n} a(k) asymptotic to C*n*log(n)*log(log(n)) for some C near 1?
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
Accumulate[MoebiusMu[2Range[110]]] (* Harvey P. Dale, Apr 30 2012 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Benoit Cloitre, Aug 28 2002
EXTENSIONS
Edited by Dean Hickerson, Sep 04 2002
STATUS
approved