OFFSET
1,1
MATHEMATICA
Accumulate[Table[MoebiusMu[n]+If[SquareFreeQ[n], 1, -1], {n, 100}]] (* Harvey P. Dale, Jun 02 2022 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Oct 19 2002
STATUS
approved