  A numerical semigroup is irreducible if it cannot be obtained as intersection
of two numerical semigroups containing it properly. If we only consider
numerical semigroups with the same Frobenius number, that concept is
generalized to atomic numerical semigroup. Based on a previous one developed to
obtain all irreducible numerical semigroups with a fixed Frobenius number, we
present an algorithm to compute all atomic numerical semigroups with a fixed
Frobenius number.
