43 (number)

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424344
Cardinalforty-three
Ordinal43rd
(forty-third)
Factorizationprime
Divisors1, 43
Roman numeralXLIII
Binary1010112
Ternary11213
Quaternary2234
Quinary1335
Senary1116
Octal538
Duodecimal3712
Hexadecimal2B16
Vigesimal2320
Base 361736
 
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424344
Cardinalforty-three
Ordinal43rd
(forty-third)
Factorizationprime
Divisors1, 43
Roman numeralXLIII
Binary1010112
Ternary11213
Quaternary2234
Quinary1335
Senary1116
Octal538
Duodecimal3712
Hexadecimal2B16
Vigesimal2320
Base 361736

43 (forty-three) is the natural number following 42 and preceding 44.

In mathematics[edit]

Forty-three is the 14th smallest prime number. The previous is forty-one, with which it comprises a twin prime, and the next is forty-seven. 43 is the smallest prime that is not a Chen prime. It is also the third Wagstaff prime.

43 is the fourth term of Sylvester's sequence, one more than the product of the previous terms (2 × 3 × 7).

43 is a centered heptagonal number.

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... (sequence A003504 in OEIS). Amazingly, a(43) is the first term of this sequence that is not an integer.

43 is a Heegner number.

43 is a repdigit in base 6 (111).

43 is the largest natural number that is not a (original) McNugget number.

415177
519136
209212
1401118

This is the smallest prime number expressible as the sum of 2, 3, 4, or 5 different primes:

The date magic square at right illustrates the magic constant as the sum of four primes:

When taking the first six terms of the Taylor series for computing e, one obtains

\sum_{i=0}^{5}\frac{1}{i!}=\frac{163}{60}=2+\frac{43}{60},\

which is also five minus the fifth harmonic number.

In science[edit]

Astronomy[edit]

In sports[edit]

In the US's National Football League, the number 43 was worn by Jim Norton of the Houston Oilers. The Oilers (now the Tennessee Titans) retired the number.

In auto racing:

In basketball:

In Ice Hockey:

In baseball:

In Motocross/Supercross

Films[edit]

Movie 43, which came out in 2013, is a film consisting of a series of interconnected short stories, featuring some of the biggest stars in Hollywood, which make up the insane storylines a washed-up producer is pitching to a movie company.

In other fields[edit]

Forty-three is:

Notes[edit]

  1. ^ Kellogg, William O. (2010). Barron's AP United States History (9th ed.). Barron's Educational Series. p. 364. ISBN 9780764141843. "George H. W. Bush (Republican) [Bush 41—i.e., the first president Bush, George H. W. Bush was the forty-first President of the United States, and so some have referred to him in this way since the election of his son, George W. Bush or Bush 43—the forty-third president of the United States.]" 

References[edit]