) is the natural number
and preceding 72
71 is the algebraic
, a remarkable
number arising in the study of look-and-say sequences
It is the 20th prime number
. The next
, with which it composes a twin prime
. It is also a permutable prime
. 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 (15th
) supersingular prime
, which is also a
. Also, 712
= 7! + 1, making it part of the last known pair of
, as (71, 7). It is
an Eisenstein prime
imaginary part and real part of the form 3n
Since 9! + 1 is divisible by 71 but 71 is not one more
than a multiple of 9, 71 is a Pillai
As 71 is the least prime factor of one more than the product of the
first twenty-two terms of the Euclid–Mullin sequence
is the twenty-third term. Also, 71 is the largest number which
occurs as a prime factor of an order of a sporadic simple group
71 is a centered heptagonal
- 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 777 March 14. The
duration of Saros series 71 was 1478.4 years, and it contained 83
- 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
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
- The number of different characters that can be used with a
standard English Keyboard,
excluding uppercase letters.
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 , named after U.S. President Theodore Roosevelt.
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).
- Lockheed SR-71 Blackbird
long-range, Mach 3 strategic reconnaissance aircraft
- "71 Fragments
of a Chronology of Chance," a film by Michael Haneke
form number for the United
States Office of Personnel Management for requesting a
leave of absence.
- Municipal Okrug #71, name of Volkovskoye Municipal Okrug of
Frunzensky District of Saint Petersburg, Russia, before 2008
- The Irish Rail 071 Class diesel locomotive.
- In the Jason Bourne novels by
American author Robert Ludlum the
department within the CIA which made Bourne and
the other super agents is called Treadstone Seventy-One.