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Abstract
We answer the Frobenius problem for a specific family of numerical semigroups with
embedding dimension 5. The numerical semigroups in this family are called fulcrum
numerical semigroups and are related to balanced and unitary numerical semigroups
introduced in earlier research. We show that fulcrum numerical semigroups come in
two distinct varieties and provide formulas for the Frobenius number and genus for
both.
Keywords
numerical semigroup, Frobenius number, Apéry set, genus
Mathematical Subject Classification
Primary: 20M14
Milestones
Received: 6 June 2022
Revised: 23 December 2022
Accepted: 23 December 2022
Published: 9 December 2023
Communicated by Nathan Kaplan
© 2023 This work is in the public domain.