43 (number)

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title: "43 (number)" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["integers"] topic_path: "general/integers" source: "https://en.wikipedia.org/wiki/43_(number)" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::data[format=table title="Infobox number"]

FieldValue
number43
factorizationprime
prime14th
divisor1, 43
::

| number = 43 | factorization = prime | prime = 14th | divisor = 1, 43

43 (forty-three) is the natural number following 42 and preceding 44.

Mathematics

43 is a prime number, and a twin prime of 41. 43 is the smallest prime that is not a Chen prime. 43 is also a Wagstaff prime, and a Heegner number. 43 is the fourth term of Sylvester's sequence.

43 is the largest prime which divides the order of the Janko group J4.

Dutch mathematician Hendrik Lenstra wrote a mathematical research paper discussing the properties of the number, titled Ode to the number 43.

::figure[src="https://upload.wikimedia.org/wikipedia/commons/f/f9/SriYantra_color.svg" caption="The [[Sri Yantra]], with nine interlocking triangles that collectively form 43 smaller triangles"] ::

Notes

References

  1. {{Cite OEIS
  2. {{Cite OEIS. A003173. Heegner numbers
  3. {{Cite OEIS

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integers