85 (eighty-five) is the

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''cardinal ...

following 84 and preceding 86.

In mathematics

85 is: * the product of two

prime number A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...

s (5 and 17), and is therefore a

semiprime In mathematics, a semiprime is a natural number that is the product of exactly two prime numbers. The two primes in the product may equal each other, so the semiprimes include the squares of prime numbers. Because there are infinitely many prime ...

; specifically, the 24th biprime not counting perfect squares. Together with 86 and 87, it forms the second cluster of three consecutive biprimes. * an

octahedral number In number theory, an octahedral number is a figurate number that represents the number of spheres in an octahedron formed from close-packed spheres. The ''n''th octahedral number O_n can be obtained by the formula:. :O_n=. The first few octahed ...

. * a

centered triangular number A centered (or centred) triangular number is a centered figurate number that represents an equilateral triangle with a dot in the center and all its other dots surrounding the center in successive equilateral triangular layers. The followin ...

. * a

centered square number In elementary number theory, a centered square number is a centered figurate number that gives the number of dots in a square with a dot in the center and all other dots surrounding the center dot in successive square layers. That is, each cen ...

. * a

decagonal number A decagonal number is a figurate number that extends the concept of triangular and square numbers to the decagon (a ten-sided polygon). However, unlike the triangular and square numbers, the patterns involved in the construction of decagonal number ...

. * the smallest number that can be expressed as a sum of two squares, with all squares greater than 1, in two ways, 85 = 9² + 2² = 7² + 6². * the length of the hypotenuse of four Pythagorean triangles. * a

Smith number In number theory, a Smith number is a composite number for which, in a given number base, the sum of its digits is equal to the sum of the digits in its prime factorization in the given number base. In the case of numbers that are not square-f ...

in decimal.

In astronomy

Messier object The Messier objects are a set of 110 astronomical objects catalogued by the French astronomer Charles Messier in his ''Catalogue des Nébuleuses et des Amas d'Étoiles'' (''Catalogue of Nebulae and Star Clusters''). Because Messier was only in ...

M85 is a

magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...

10.5

lenticular galaxy A lenticular galaxy (denoted S0) is a type of galaxy intermediate between an elliptical (denoted E) and a spiral galaxy in galaxy morphological classification schemes. It contains a large-scale disc but does not have large-scale spiral arms. ...

in the constellation

Coma Berenices Coma Berenices is an ancient asterism in the northern sky, which has been defined as one of the 88 modern constellations. It is in the direction of the fourth galactic quadrant, between Leo and Boötes, and it is visible in both hemisphe ...

* NGC 85 is a galaxy in the constellation Andromeda *

85 Io Io ( minor planet designation: 85 Io is carbonaceous asteroid from the central region of the asteroid belt, approximately 170 kilometers in diameter. It is an identified Eunomian interloper. Discovery and naming It was discovered by C. H. ...

is a large main belt asteroid *

85 Pegasi 85 Pegasi is a multiple star system 39.5 light years away in the constellation of Pegasus. The primary component is sixth magnitude 85 Pegasi A, which is a yellow dwarf like the Sun. The secondary component, 85 Pegasi B, is a ninth m ...

is a multiple star system in constellation of Pegasus *

85 Ceti 85 Ceti is an older Flamsteed designation for a star that is now within the borders of the northern constellation of Aries, the ram. In the present day it is known by star catalogue designations such as ''HD 16861'' and ''HR 797''. It ...

is a variable star in the constellation of

Cetus Cetus () is a constellation, sometimes called 'the whale' in English. The Cetus was a sea monster in Greek mythology which both Perseus and Heracles needed to slay. Cetus is in the region of the sky that contains other water-related constellat ...

85D/Boethin Comet Boethin (officially 85D/Boethin) was a periodic Jupiter-family comet discovered in 1975 by Leo Boethin. It appeared again in January 1986 as expected. Although the comet was next expected at perihelion in April 1997, no observations were re ...

is a periodic comet

In titles and names

* '' Federalist No. 85'', by Alexander Hamilton, the last of ''

The Federalist Papers ''The Federalist Papers'' is a collection of 85 articles and essays written by Alexander Hamilton, James Madison, and John Jay under the collective pseudonym "Publius" to promote the ratification of the Constitution of the United States. The c ...

'' (1788) * ''

The 85 Ways to Tie a Tie ''The 85 Ways to Tie a Tie'' is a book by Thomas Fink and Yong Mao about the history of the knotted neckcloth, the modern necktie, and how to tie each. It is based on two mathematics papers published by the authors in ''Nature'' and '' Physic ...

'', a book by

Thomas Fink Thomas Fink (born 1972) is an Anglo-American physicist, author and entrepreneur. He has published papers in statistical physics and its applications, written two books and designed an iPhone app. He set up the London Institute for Mathematica ...

and Yong Mao * ''85 Days: The Last Campaign of Robert Kennedy'' a book by Jules Witcover * '' Live/1975–85'', an album of live recordings by Bruce Springsteen (1986) * '' 80–85'' a compilation album by Bad Religion (1991) * '' Cupid & Psyche 85'', an album by band Scritti Politti (1985) * '' 45/85'' was a television documentary on World War II * Minuscule 85,

Papyrus 85 Papyrus 85 (in the Gregory-Aland numbering), designated by 𝔓85, is an early copy of the New Testament in Greek. It is a papyrus manuscript of the Book of Revelation. The manuscript paleographically has been assigned to the 4th century (or the ...

, Lectionary 85 are early Greek manuscripts of the

New Testament The New Testament grc, Ἡ Καινὴ Διαθήκη, transl. ; la, Novum Testamentum. (NT) is the second division of the Christian biblical canon. It discusses the teachings and person of Jesus, as well as events in first-century Chri ...

* "85", a 2000 rap single by

YoungBloodz YoungBloodZ is an American Southern hip hop duo from Atlanta, Georgia composed of J-Bo (born Jeffrey Raymond Grigsby on October 4, 1977) and Sean P (born Sean Paul Ryan Joseph on March 7, 1978). The duo was signed to LaFace Records. They are o ...

, from their album '' Against Da Grain'' * 85°C, a Taiwanese coffee store chain.

In sports

In U.S. college athletics, schools that are members of

NCAA Division I NCAA Division I (D-I) is the highest level of intercollegiate athletics sanctioned by the National Collegiate Athletic Association (NCAA) in the United States, which accepts players globally. D-I schools include the major collegiate athletic ...

are limited to providing

athletic scholarship An athletic scholarship is a form of scholarship to attend a college or university or a private high school awarded to an individual based predominantly on his or her ability to play in a sport. Athletic scholarships are common in the United ...

s to a maximum of 85 football players in a given season. The specifics vary by the two Division I football subdivisions: * In the top-level FBS, each player provided with a scholarship may, and almost always does, receive a full scholarship. * In the second-level FCS, schools are allowed to provide football-related athletic aid equivalent to 63 full scholarships, but this aid may be divided among up to 85 players as the schools see fit.

In other fields

* The year AD 85,

85 BC __NOTOC__ Year 85 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Cinna and Carbo (or, less frequently, year 669 ''Ab urbe condita''). The denomination 85 BC for this year has been used s ...

, or 1985. * The Muslim calendar year 85 AH. * The

atomic number The atomic number or nuclear charge number (symbol ''Z'') of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number (''n''p) or the number of protons found in the nucleus of every ...

of the chemical element

astatine Astatine is a chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. All of astatine's isotopes are short-li ...

* The number of the French department

Vendée Vendée (; br, Vande) is a department in the Pays de la Loire region in Western France, on the Atlantic coast. In 2019, it had a population of 685,442.

* The ISBN Group Identifier for books published in

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

* The radix of the

Ascii85 Ascii85, also called Base85, is a form of binary-to-text encoding developed by Paul E. Rutter for the btoa utility. By using five ASCII characters to represent four bytes of binary data (making the encoded size larger than the original, assuming e ...

(sometimes called Base85) binary-to-text encoding * The IQ and nickname of Aaron in ''

Alien 3 ''Alien 3'' (stylized as ''A''LIEN³) is a 1992 American science fiction horror film directed by David Fincher and written by David Giler, Walter Hill, and Larry Ferguson, from a story by Vincent Ward. It stars Sigourney Weaver, reprising her ...

'' * The number worn by

Chad Ochocinco Chad Ochocinco Johnson (born Chad Javon Johnson; January 9, 1978), known from 2008 to 2012 as Chad Ochocinco, is a former American football wide receiver. He played college football for Santa Monica College and Oregon State University, and p ...

, whose name means "eight five" in Spanish * Arabigere 85 is a village in India *

E85 E85 is an abbreviation typically referring to an ethanol fuel blend of 85% ethanol fuel and 15% gasoline or other hydrocarbon by volume. In the United States, the exact ratio of fuel ethanol to hydrocarbon may vary according to ASTM 5798 that ...

fuel is 85% ethanol and 15% conventional gasoline * MCS-85 was a family of

Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California. It is the world's largest semiconductor chip manufacturer by revenue, and is one of the developers of the x86 seri ...

processors including the 8085 *

TI-85 The TI-85 is a graphing calculator made by Texas Instruments based on the Zilog Z80 microprocessor. Designed in 1992 as TI's second graphing calculator (the first was the TI-81), it was replaced by the TI-86, which has also been discontinued ...

was a graphing pocket calculator by

Texas Instruments Texas Instruments Incorporated (TI) is an American technology company headquartered in Dallas, Texas, that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globa ...

* KC 85 was a family of small computers built in

East Germany East Germany, officially the German Democratic Republic (GDR; german: Deutsche Demokratische Republik, , DDR, ), was a country that existed from its creation on 7 October 1949 until its dissolution on 3 October 1990. In these years the state ...

in the 1980s * PMD 85 was a personal computer built in

Czechoslovakia , rue, Чеськословеньско, , yi, טשעכאסלאוואקיי, , common_name = Czechoslovakia , life_span = 1918–19391945–1992 , p1 = Austria-Hungary , image_p1 ...

in 1985 * Learjet 85 is an all-composite plane being developed by

Bombardier Aerospace Bombardier Aviation is a division of Bombardier Inc. It is headquartered in Dorval, Quebec, Canada. Its most popular aircraft included the Dash 8 Series 400, CRJ100/200/440, and CRJ700/900/1000 lines of regional airliners, and the newer CS ...

* British Rail Class 85, a category of UK train locomotives * DRG Class 85, a category of German train locomotives *

TK85 The TK85 was a ZX81 clone made by Microdigital Eletrônica, a computer company located in Brazil. It came with 16 or 48 KB RAM, and had a ZX Spectrum–style case, similar to a '' Timex Sinclair 1500''. Unlike the ZX81, the TK85 used discr ...

was a clone of the

Sinclair ZX81 The ZX81 is a home computer that was produced by Sinclair Research and manufactured in Dundee, Scotland, by Timex Corporation. It was launched in the United Kingdom in March 1981 as the successor to Sinclair's ZX80 and designed to be a low-co ...

made in Brazil in 1983 *

Lima Site 85 Lima Site 85 (LS-85 alphanumeric code of the phonetic 1st letter used to conceal this covert operation) was a clandestine military installation in the Royal Kingdom of Laos guarded by the Hmong "Secret Army", the Central Intelligence Agency, a ...

was a battle in the Vietnam War * A85 is the Dutch Defence in the ''Encyclopaedia of Chess'' * EF 85mm is a photographic camera lens by Canon * F85 (disambiguation), multiple uses * Part of the assignation for the Toyota AE85, commonly referred to as an "eight-five".

In military technology

* 85mm is a common caliber for cannons * SU-85 was a Soviet tank *

TR-85 The TR-85 is a third-generation main battle tank designed for the armed forces of Romania. Based on the TR-77-580, the TR-85 tank was developed from 1978 to 1985 and produced from 1986 until 1990. A modernization program was initiated in Marc ...

was a Romanian battle tank * Tu-85 was a prototype Soviet bomber *

ASU-85 The ASU-85 (russian: Авиадесантная самоходная установка, АСУ-85, Aviadesantnaya Samokhodnaya Ustanovka, ASU-85 – airborne self-propelled mount) is a Soviet-designed airborne self-propelled gun of the Cold War ...

a Soviet self-propelled gun *

CZ 85 The CZ 85 is a semi-automatic pistol chambered for 9×19mm Parabellum.The Complete Encyclopedia of Pistols and Revolvers, A.E. Hartink, page 108 It was manufactured in Czechoslovakia (now the Czech Republic) by Česká zbrojovka firearms, Česká Z ...

is a Czech 9mm semiautomatic pistol * PT-85 is a Korean tank * 7.62 Tkiv 85 is a Finnish army rifle * HG 85 is a Swiss fragmentation grenade *

Taurus Model 85 The Taurus Model 85 is a small-frame revolver manufactured by Taurus International. In the United States, the guns are marketed for concealed carry and personal protection. Specifications The Model 85 is available in several configurations. Th ...

, a 9mm revolver made in Brazil

References

External links

85
* Jorge Stolfi
The Hollywood Constant
{{DEFAULTSORT:85 (Number) Integers

In mathematics

In astronomy

In titles and names

In sports

In other fields

In military technology

See also

References

External links