OFFSET
1
COMMENTS
Dirichlet inverse of A005361.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Ilya Gutkovskiy, Scatterplot of partial sums of A332732
FORMULA
a(1) = 1; a(n) = -Sum_{d|n, d<n} A005361(n/d) * a(d).
Multiplicative with a(p^e) = A163810(e). - Amiram Eldar, Nov 30 2020
MATHEMATICA
a[1] = 1; a[n_] := -Sum[If[d < n, Times @@ (#[[2]] & /@ FactorInteger[n/d]) a[d], 0], {d, Divisors[n]}]; Table[a[n], {n, 1, 100}]
CROSSREFS
KEYWORD
sign,mult
AUTHOR
Ilya Gutkovskiy, Feb 21 2020
STATUS
approved