OFFSET
1,3
EXAMPLE
For n = 4, A007955(n) = b(n): a(4) = b(1)*mu(1) + b(2)*mu(2) + b(4)*mu(4) = 1*1 + 2*(-1) + 8*0 = -1.
MATHEMATICA
a[n_] := DivisorSum[n, #^(DivisorSigma[0, #]/2) * MoebiusMu[#] &]; Array[a, 60] (* Amiram Eldar, Aug 06 2024 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Jaroslav Krizek, Apr 02 2010
EXTENSIONS
More terms from Amiram Eldar, Aug 06 2024
STATUS
approved