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Natural number
43 (forty-three) is the natural number following 42 and preceding 44.
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.
The Sri Yantra, with nine interlocking triangles that collectively form 43 smaller trianglesLenstra, Hendrik (2009). Ode to the number 43 (In Dutch). Nieuw Arch. Wiskd. Amsterdam, NL: Koninklijk Wiskundig Genootschap (5) 10, No. 4: 240-244. MR2590266 Zbl 1263.00002
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