OFFSET
1,12
LINKS
Eric Weisstein's World of Mathematics, Prime Factor
FORMULA
G.f. A(x) satisfies: A(x) = x - Sum_{k>=2} bigomega(k) * A(x^k).
Dirichlet g.f.: 1 / (1 + zeta(s) * Sum_{k>=1} primezeta(k*s)).
MATHEMATICA
a[n_] := If[n == 1, n, -Sum[If[d < n, PrimeOmega[n/d] a[d], 0], {d, Divisors[n]}]]; Table[a[n], {n, 92}]
CROSSREFS
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, May 09 2020
STATUS
approved