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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.
Let a0 = a1 = 1, and thenceforth an = 1/(a02 + a12 + ... + an − 12). This sequence continues 1, 1, 2, 3, 5, 10, 28, 154... (sequence A003504 in the OEIS). a43 is the first term of this sequence that is not an integer.
43 is a repdigit in base 6 (111).
This is the smallest prime number expressible as the sum of 2, 3, 4, or 5 different primes:
- 43 = 41 + 2
- 43 = 11 + 13 + 19
- 43 = 2 + 11 + 13 + 17
- 43 = 3 + 5 + 7 + 11 + 17.
- The chemical element with the atomic number 43 is technetium. It has the lowest atomic number of any element that does not possess stable isotopes.
- Messier object M43, a magnitude 7.0 H II region in the constellation of Orion, a part of the Orion Nebula, and also sometimes known as de Mairan's Nebula
- The New General Catalogue object NGC 43, a barred spiral galaxy in the constellation Andromeda
- The Saros number of the solar eclipse series which began on April 29, 1513 BC and ended on June 5, 233 BC . The duration of Saros series 43 was 1280.1 years, and it contained 72 solar eclipses.
- The Saros number of the lunar eclipse series which began on August 27, 1482 BC and ended on March 15, 70. The duration of Saros series 43 was 1550.5 years, and it contained 87 lunar eclipses.
In auto racing:
- The number for Richard Petty's race car when he won his seven Winston Cup Championships. He also won 200 races in his career, 95% of them in the famous #43.
- The maximum number of cars participating in a NASCAR race in the Cup Series, and, through the 2012 season, the Nationwide Series.
- The number is also used by Ken Block on his rally cars.
- Brad Daugherty, ESPN NASCAR analyst and retired American basketball player. His #43 jersey, a number he picked as a tribute to NASCAR legend Richard Petty (whom Daugherty lists as his favorite sportsman), was retired by the Cavaliers on March 1, 1997.
- Joey Savatgy ran the number 43 in the 2014 250MX and 250SX series and was sponsored by Armswag.
Arts, entertainment, and media
- Movie 43 (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 The Big Bang Theory episode "The 43 Peculiarity", Howard and Raj try to solve the mystery of Sheldon disappearing every afternoon to a room with a chalkboard that has the number 43 written on it.
- Odd Squad Agent 43 is one of the main villains: Agent Todd who later was fired for causing oddness. Odd Todd now gave up doing odd and now works in a community garden.
- Number 43, in Sonnets from the Portuguese (1850), is one of Elizabeth Barrett Browning's most famous poems.
In other fields
- The designation of Interstate 43, a freeway in Wisconsin.
- +43, the code for direct dial international phone calls to Austria.
- Bush 43, George W. Bush, 43rd President of the United States.
- "43", a song by Level 42 on the album Level 42.
- "43," a song by metal band Mushroomhead on the albums "Mushroomhead" and "XX"
- U.S.S. Coral Sea CV-43 (aircraft carrier).
- The name of a popular Spanish liqueur, Cuarenta y tres, which is distilled with 43 different herbs and spices.
- in the lyrics of at least two operas: W. S. Gilbert's Trial by Jury and Lorenzo Da Ponte's Le nozze di Figaro.
- "Sloane's A000979 : Wagstaff primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A000058 : Sylvester's sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A069099 : Centered heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A003173 : Heegner numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "Sloane's A065003 : Not McNugget numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- "The Fifteen Puzzle can be solved in 43 "moves"". Domain of the Cube Forum
- 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.]
- Lehmer, Derrick, List of prime numbers from 1 to 10,006,721, Carnegie Institution of Washington, 1914
- Wells, David, Prime Numbers: The Most Mysterious Figures in Math, Wiley, 2005, ISBN 0-471-46234-9
- Crandall, Richard and Pomerance, Carl, Prime Numbers: A Computational Perspective, Springer, 2005, ISBN 0-387-25282-7