"number theorist" meaning in English

{
  "forms": [
    {
      "form": "number theorists",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "number theorist (plural number theorists)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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        {
          "kind": "other",
          "langcode": "en",
          "name": "Mathematicians",
          "orig": "en:Mathematicians",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Number theory",
          "orig": "en:Number theory",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A mathematician who specializes in number theory"
      ],
      "id": "en-number_theorist-en-noun-An4K0rU2",
      "links": [
        [
          "mathematician",
          "mathematician"
        ],
        [
          "number theory",
          "number theory"
        ]
      ]
    }
  ],
  "word": "number theorist"
}

{
  "forms": [
    {
      "form": "number theorists",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "number theorist (plural number theorists)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Mathematicians",
        "en:Number theory"
      ],
      "glosses": [
        "A mathematician who specializes in number theory"
      ],
      "links": [
        [
          "mathematician",
          "mathematician"
        ],
        [
          "number theory",
          "number theory"
        ]
      ]
    }
  ],
  "word": "number theorist"
}