43

43 (forty-three) is a positive integer following 42 and preceding 44. Its ordinal form is written "forty-third" or 43rd.
== Properties ==
*43 is an .
*It is the smallest prime that is not a .Wolfram, Chen Prime
*It is the fourth number of Sylvester's sequence.
*The first naturally occurring radioactive element is , with atomic number 43.
== In googology ==
In Greek-based number-naming systems, 43 is associated with prefix "tritetraconta-", and with prefix "trequadraginti-" in Latin systems.
== Sources ==
Category:Numbers
Category:Class 1
Category:Numbers 0-99
Category:Prime numbers
Category:Numbers with 1 to 2 digits