{
  "domain": "mathematics",
  "topics": [
    "number-theory",
    "algebra",
    "combinatorics"
  ],
  "type": "construction",
  "also": [
    "proof"
  ],
  "source": {
    "key": "frontiermath-open",
    "name": "FrontierMath: Open Problems",
    "url": "https://epoch.ai/frontiermath/open-problems/numerical-semigroups",
    "id": "numerical-semigroups",
    "curator": "Epoch AI",
    "poser": "Herbert S. Wilf",
    "status": "unsolved",
    "as_of": "2026-10-20",
    "catalog": "0521c19bbd38"
  },
  "review": true,
  "approval": "first-time"
}