OFFSET
0,4
MAPLE
seq(abs(sum(mobius(x), x=0..a)), a=0..100);
MATHEMATICA
Accumulate[Join[{-1}, MoebiusMu[Range[110]]]] (* Harvey P. Dale, Jun 20 2017 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Jorge Coveiro, Dec 27 2004
STATUS
approved