43 (number) Guide, Meaning , Facts, Information and Description

43 is the natural number following 42 and preceding 44.

Cardinal	forty-three
Ordinal	43rd (forty-third)
Factorization	prime
Roman numeral	XLIII
Binary	101011
Hexadecimal	2B

In mathematics

Forty-three is the 14th smallest prime number. The previous is forty-one, with which it comprises a twin prime, the next is forty-seven.

Let a(0) = a(1) = 1, and thenceforth a(n) = (a(0)² + a(1)² + ... + a(n-1)²) / (n-1). This sequence continues 1 1 2 3 5 10 28 154... (A003504 in OEIS). Amazingly, a(43) is the first term of this sequence that is not an integer.

Negative forty-three (-43) is a Heegner number.

In other fields

Forty-three is also:

• The atomic number of technetium.
• The designation of Interstate 43, a freeway in Wisconsin.
• The code for direct dial international phone calls to Austria.
• Part of the title of the historical British comedy show Hancock's Forty-Three Minutes, starring Tony Hancock.
• Part of the title of a historical short story by Hershel Finman titled Forty-Three Rubles, about Rabbi Zvi Elimelech Spira.
• The year AD 43, 43 BC, and 1943.

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