43 (number)

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

← 40 41 42 43 44 45 46 47 48 49 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	43 forty-three
Ordinal	43rd forty-third
Factorization	prime
Divisors	1, 43
Roman numeral	XLIII
Binary	101011
Hexadecimal	2B

Contents 1 In mathematics 2 In science 2.1 Astronomy 3 In sports 4 In other fields 5 Historical years 6 External links

[edit] In mathematics

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 an (original) McNugget number.

This is the smallest number, which draws up as sum of 2,3,4,5 different primes: 43=41+2 43=11+13+19 43=2+11+13+17 43=3+5+7+11+17. The following date magic square illustrates the magic constant as the sum of four primes:

4	15	17	07
5	19	13	6
20	9	2	12
14	0	11	18

[edit] In science

• 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.

[edit] Astronomy

• 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.

[edit] In sports

In professional sports in the United States, the jersey number 43 has been retired for Jim Norton of Tennessee (NFL) and Dennis Eckersley of the Oakland Athletics.

Mad Magazine created the game 43-Man Squamish.

[edit] In other fields

Forty-three is:

• The designation of Interstate 43, a freeway in Wisconsin.
• The code for direct dial international phone calls to Austria.
• The number of times Danny croaks "Redrum" before his mother wakes up and Jack starts to break into the apartment in Steven King's The Shining.
• Part of the title of the historical British comedy show Hancock's Forty-Three Minutes, starring Tony Hancock.
• The number of poppadoms ordered by the nine guests at a curry restaurant in Rowan Atkinson's classic Indian Waiter stand-up comedy sketch.
• Part of the title of a historical short story by Hershel Finman titled Forty-Three Rubles, about Rabbi Zvi Elimelech Spira.
• The number for Richard Petty's NASCAR racecar when he won his 7 Winston Cup Championships. He also won 200 races in his career, 95% of them in the famous #43.
• The typical number of cars that participate in a NASCAR Nextel Cup Series race.
• The number of hours the official countdown clock starts from before a launch of the Space Shuttle.
• The name of a luxury boutique hotel in Boise Idaho.
• A Spanish liquor LICOR 43, derived from the 43 basic elements which compose it, principally fruit and fragant herbs.

Idaho was the 43rd state to join the Union.

[edit] Historical years

43 A.D., 43 B.C., 1943, 2043, etc.

[edit] External links

• 43drills.com
• 43folders.com, a personal blog dedicated to lifehacks, where 43 is the number of file folders required to maintain a "tickler file" in David Allen's Getting Things Done personal productivity methodology
• 43things.com, 43people.com and 43places.com, all social networking sites run by The Robot Co-op.
• interstate forty-three, a personal blog dedicated to bizarre facts about the number 43.

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