43 (number)

← 42 43 44 →
Cardinalforty-three
Ordinal43rd
(forty-third)
Factorizationprime
Prime14th
Divisors1, 43
Greek numeralΜΓ´
Roman numeralXLIII, xliii
Binary1010112
Ternary11213
Senary1116
Octal538
Duodecimal3712
Hexadecimal2B16

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.

The Sri Yantra, with nine interlocking triangles that collectively form 43 smaller triangles

Notes

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. MR 2590266 Zbl 1263.00002

allikas: https://en.wikipedia.org/wiki/43_(number)