71 (NUMBER)

'71' ('seventy-one') is the natural number following 70 and preceding 72.

Cardinal	71 seventy-one
Ordinal	71st seventy-first
Factorization	''prime''
Divisors	1, 71
Roman numeral	LXXI
Binary	1000111
Hexadecimal	47

Contents

In mathematics

In science

In Judaism

In other fields

In sports

In mathematics

71 is the algebraic degree of Conway's constant, a remarkable number arising in the study of look-and-say sequences.
It is the 20th prime number. The next is 73, with which it composes a twin prime. It is also a permutable prime with 17. If we add up the primes less than 71 (2 through 67), we get 568, which is divisible by 71, 8 times. 71 is the largest supersingular prime. Also, 71² = 7! + 1, making it part of the last known pair of Brown numbers, as (71, 7). It is an Eisenstein prime with no imaginary part and real part of the form $3n\; -\; 1$. Since 9! + 1 is divisible by 71 but 71 is not one more than a multiple of 9, 71 is a Pillai prime.
71 is a centered heptagonal number.

In science

★ The atomic number of lutetium, a lanthanide
'In astronomy',
: Messier object M71, a magnitude 8.5 globular cluster in the constellation Sagitta
: The New General Catalogue object NGC 71, a magnitude 13.2 peculiar spiral galaxy in the constellation Andromeda
:The Saros number of the solar eclipse series which began on -702 October 8 and ended on 777March 14. The duration of Saros series 71 was 1478.4 years, and it contained 83 solar eclipses.
:The Saros number of the lunar eclipse series which began on -472 June 4 and ended on 808 July 11. The duration of Saros series 71 was 1280.1 years, and it contained 72 lunar eclipses.

In Judaism

In ancient Israel there was a Sanhedrin headquarters it had 71 judges who judged cases where the criminal deserved the death penalty

In other fields

'Seventy-one' is also:

★ The designation of USA Interstate 71, which runs from Kentucky to Ohio.

★ The registry of the U.S. Navy's nuclear aircraft carrier USS Theodore Roosevelt (CVN-71), named after U.S. President Theodore Roosevelt.

★ The number of the French department Saône-et-Loire.

★ The year AD '71', 71 BC, or 1971.

★ In the Mexican television sitcom, El Chavo del Ocho, Doña Clotilde lives in the apartment number 71, being therefore known as "Bruja del 71" (Witch of 71).

★ Affiliated with visual artist, DJ, and record producer Odd Nosdam

★ Lockheed SR-71 Blackbird long-range, Mach 3 strategic reconnaissance aircraft

★ Israel Prime Minister Yitzhak Rabin signed a historic agreement with the P.L.O. in 1993, at age 71

★ "71 Fragments of a Chronology of Chance," a film by Michael Haneke

In sports

★ The best-known car number of NASCAR legend Dave Marcis

★ Casey Stengel was 71 when he began managing the New York Mets in 1962

★ Bill Horning won the 2004 U.S. Adult National Figure Skating Championships at age 71

★ Wayne Gretzky scored 71 goals with the Edmonton Oilers in the 1982-83 season

★ Barry Bonds hit his 71st home run of 2001 against the Dodgers on October 5, 2001

★ NFL Green Bay Packers Bill Forester wore #71

★ NHL Boston Bruins Davis Payne wore #71

★ NHL Nashville Predators J.P. Dumont wears #71

★ NHL Pittsburgh Penguins Evgeni Malkin wears #71

★ NHL Boston Bruins Jiri Slegr wears #71

★ Bike number of Motocross Legend Caitlin Tolone