43 (number)

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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,[1] and a Heegner number.[2] 43 is the fourth term of Sylvester's sequence.[3]

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.

File:SriYantra color.svg
The Sri Yantra, with nine interlocking triangles that collectively form 43 smaller triangles

Notes

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  1. ↑ Script error: No such module "citation/CS1".Script error: No such module "Check for unknown parameters".
  2. ↑ Script error: No such module "citation/CS1".Script error: No such module "Check for unknown parameters".
  3. ↑ Script error: No such module "citation/CS1".Script error: No such module "Check for unknown parameters".

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Further reading

Lenstra, Hendrik (2009). Ode to the number 43 (In Dutch). Nieuw Arch. Wiskd. Amsterdam, NL: Koninklijk Wiskundig Genootschap (5) 10, No. 4: 240-244. MRTemplate:Catalog lookup link Template:Catalog lookup link

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