101 (one hundred
ndone) 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 n ...
following
100 and preceding
102 102 may refer to:
* 102 (number), the number
* AD 102, a year in the 2nd century AD
* 102 BC, a year in the 2nd century BC
* 102 (ambulance service), an emergency medical transport service in Uttar Pradesh, India
* 102 (Clyde) Field Squadron, Royal ...
.
It is variously pronounced "one hundred and one" / "a hundred and one", "one hundred one" / "a hundred one", and "one oh one". As an
ordinal number
In set theory, an ordinal number, or ordinal, is a generalization of ordinal numerals (first, second, th, etc.) aimed to extend enumeration to infinite sets.
A finite set can be enumerated by successively labeling each element with the least n ...
, 101st (one hundred
ndfirst), rather than 101th, is the correct form.
In mathematics
101 is:
*the 26th
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 ...
, and the smallest above 100.
*a
palindromic number
A palindromic number (also known as a numeral palindrome or a numeric palindrome) is a number (such as 16461) that remains the same when its digits are reversed. In other words, it has reflectional symmetry across a vertical axis. The term ''palin ...
in base 10, and so a
palindromic prime
In mathematics, a palindromic prime (sometimes called a palprime) is a prime number that is also a palindromic number. Palindromicity depends on the base of the number system and its notational conventions, while primality is independent of such ...
.
*a
Chen prime
A prime number ''p'' is called a Chen prime if ''p'' + 2 is either a prime or a product of two primes (also called a semiprime). The even number 2''p'' + 2 therefore satisfies Chen's theorem.
The Chen primes are named after Chen Jin ...
since
103 is also prime, with which it makes a
twin prime
A twin prime is a prime number that is either 2 less or 2 more than another prime number—for example, either member of the twin prime pair (41, 43). In other words, a twin prime is a prime that has a prime gap of two. Sometimes the term ''twin pr ...
pair.
*a
sexy prime
In number theory, sexy primes are prime numbers that differ from each other by 6. For example, the numbers 5 and 11 are both sexy primes, because both are prime and .
The term "sexy prime" is a pun stemming from the Latin word for six: .
If o ...
since 107 and 113 are also prime, with which it makes a sexy prime triplet.
*a
unique prime
The reciprocals of prime numbers have been of interest to mathematicians for various reasons. They do not have a finite sum, as Leonhard Euler proved in 1737.
Like all rational numbers, the reciprocals of primes have repeating decimal represen ...
, because the period length of its reciprocal is unique among primes.
*an
Eisenstein prime
In mathematics, an Eisenstein prime is an Eisenstein integer
: z = a + b\,\omega, \quad \text \quad \omega = e^,
that is irreducible (or equivalently prime) in the ring-theoretic sense: its only Eisenstein divisors are the units , itself ...
with no
imaginary part
In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted , called the imaginary unit and satisfying the equation i^= -1; every complex number can be expressed in the form ...
and
real part
In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted , called the imaginary unit and satisfying the equation i^= -1; every complex number can be expressed in the form a ...
of the form
.
*the fifth
alternating factorial
Alternating may refer to:
Mathematics
* Alternating algebra, an algebra in which odd-grade elements square to zero
* Alternating form, a function formula in algebra
* Alternating group, the group of even permutations of a finite set
* Alternati ...
.
*a
centered decagonal number
A centered decagonal number is a centered figurate number that represents a decagon with a dot in the center and all other dots surrounding the center dot in successive decagonal layers. The centered decagonal number for ''n'' is given by the ...
.
*the only existing prime with alternating 1s and 0s in
base 10
The decimal numeral system (also called the base-ten positional numeral system and denary or decanary) is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers of the Hindu–Arabic numeral ...
and the largest known prime of the form 10
''n'' + 1.
* the number of compositions of 12 into distinct parts.
Given 101, the
Mertens function
In number theory, the Mertens function is defined for all positive integers ''n'' as
: M(n) = \sum_^n \mu(k),
where \mu(k) is the Möbius function. The function is named in honour of Franz Mertens. This definition can be extended to positive r ...
returns
0. It is the second prime having this property.
For a 3-digit number in base 10, this number has a relatively simple
divisibility test
A divisibility rule is a shorthand and useful way of determining whether a given integer is divisible by a fixed divisor without performing the division, usually by examining its digits. Although there are divisibility tests for numbers in any radi ...
. The candidate number is split into groups of four, starting with the rightmost four, and added up to produce a 4-digit number. If this 4-digit number is of the form 1000''a'' + 100''b'' + 10''a'' + ''b'' (where ''a'' and ''b'' are integers from 0 to 9), such as 3232 or 9797, or of the form 100''b'' + ''b'', such as 707 and 808, then the number is divisible by 101.
On the
seven-segment display
A seven-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays.
Seven-segment displays are widely used in digital clocks, electronic meters, basic ...
of a calculator, 101 is both a
strobogrammatic prime
A strobogrammatic number is a number whose numeral is rotationally symmetric, so that it appears the same when rotated 180 degrees. In other words, the numeral looks the same right-side up and upside down (e.g., 69, 96, 1001). A strobogrammatic ...
and a
dihedral prime
A dihedral prime or dihedral calculator prime is a prime number that still reads like itself or another prime number when read in a seven-segment display, regardless of orientation (normally or upside down), and surface (actual display or reflectio ...
.
In science
* In
mineralogy
Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical) properties of minerals and mineralized artifacts. Specific studies within mineralogy include the proces ...
, a
Miller index
Miller indices form a notation system in crystallography for lattice planes in crystal (Bravais) lattices.
In particular, a family of lattice planes of a given (direct) Bravais lattice is determined by three integers ''h'', ''k'', and '' ...
of 101 is a crystal face that crosses the horizontal axis (a) and 3D vertical axis (c) but does not cross the 2D vertical axis (b).
* In physics and chemistry, it is 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
mendelevium
Mendelevium is a synthetic element with the symbol Md ( formerly Mv) and atomic number 101. A metallic radioactive transuranium element in the actinide series, it is the first element by atomic number that currently cannot be produced in macroscopi ...
, an actinide.
* In astronomy it is the Messier designation given to the
Pinwheel Galaxy
The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy away from Earth in the constellation Ursa Major. It was discovered by Pierre Méchain in 1781 and was communicated that year to Charles Messier, who ...
in Ursa Major.
In books
According to
Books in Print
R. R. Bowker LLC (trading as Bowker) is an American limited liability company domiciled under Delaware Limited Liability Company Law and based in Chatham, New Jersey. Among other things, Bowker provides bibliographic information on publishe ...
, more books are now published with a title that begins with '101' than '100'. They usually describe or discuss a list of items, such as ''101 Ways to...'' or ''101 Questions and Answers About...'' . This marketing tool is used to imply that the customer is given a little extra information beyond books that include only 100 items. Some books have taken this marketing scheme even further with titles that begin with '102', '103', or '1001'. The number is used in this context as a
slang
Slang is vocabulary (words, phrases, and linguistic usages) of an informal register, common in spoken conversation but avoided in formal writing. It also sometimes refers to the language generally exclusive to the members of particular in-gro ...
term when referring to "a 101 document" what is usually referred to as a
statistical survey
Survey methodology is "the study of survey methods".
As a field of applied statistics concentrating on human-research surveys, survey methodology studies the sampling of individual units from a population and associated techniques of survey da ...
or overview of some topic.
Room 101
The Ministry of Truth, the Ministry of Peace, the Ministry of Love, and the Ministry of Plenty are the four ministries of the government of Oceania in the 1949 dystopian novel ''Nineteen Eighty-Four'', by George Orwell.
The use of contradictory ...
is a torture chamber in the novel ''
Nineteen Eighty-Four
''Nineteen Eighty-Four'' (also stylised as ''1984'') is a dystopian social science fiction novel and cautionary tale written by the English writer George Orwell. It was published on 8 June 1949 by Secker & Warburg as Orwell's ninth and final ...
'' by
George Orwell
Eric Arthur Blair (25 June 1903 – 21 January 1950), better known by his pen name George Orwell, was an English novelist, essayist, journalist, and critic. His work is characterised by lucid prose, social criticism, opposition to totalitar ...
.
In education
In American university course numbering systems, the number 101 is often used for an introductory course at a beginner's level in a department's subject area. This common numbering system was designed to make
transfer between colleges easier. In theory, any numbered course in one
academic institution
Academic institution is an educational institution dedicated to education and research, which grants academic degrees. See also academy and university.
Types
* Primary schools – (from French ''école primaire'') institutions where children r ...
should bring a student to the same standard as a similarly numbered course at other institutions. The term was first introduced by the
University of Buffalo
The State University of New York at Buffalo, commonly called the University at Buffalo (UB) and sometimes called SUNY Buffalo, is a public research university with campuses in Buffalo and Amherst, New York. The university was founded in 1846 ...
in 1929.
Based on this usage, the term "
101" has been extended to mean an introductory level of
learning
Learning is the process of acquiring new understanding, knowledge, behaviors, skills, value (personal and cultural), values, attitudes, and preferences. The ability to learn is possessed by humans, animals, and some machine learning, machines ...
or a collection of introductory materials to a topic.
In other fields
* ''
Charter of the French Language
The ''Charter of the French Language'' (french: link=no, La charte de la langue française), also known in English as Bill 101, Law 101 (''french: link=no, Loi 101''), or Quebec French Preference Law, is a law in the province of Quebec in Canada ...
'', Bill 101.
*
Taipei 101
Taipei 101 (; stylized as TAIPEI 101), formerly known as the Taipei World Financial Center, is a supertall skyscraper in Taipei, Taiwan. This building was officially classified as the world's tallest from its opening in 2004 until the 2009 ...
, the tallest skyscraper in the world from 2004 to 2010.
*
101st kilometre The 101st kilometre (russian: 101-й километр, ''sto pervyy kilometr'') is a colloquial phrase for restrictions on freedom of movement in the Soviet Union.
Etymology
The phrase "101st kilometre" was first coined after the Soviet Union hoste ...
, a condition of release from the
Gulag
The Gulag, an acronym for , , "chief administration of the camps". The original name given to the system of camps controlled by the GPU was the Main Administration of Corrective Labor Camps (, )., name=, group= was the government agency in ...
in the Soviet Union.
*
101 Ranch Oil Company
Founded in 1908 by oil exploration pioneer E. W. Marland, The 101 Ranch Oil Company was located on the Miller Brothers 101 Ranch and headquartered in Ponca City, Oklahoma. The company's 1911 oil discovery in North Eastern Oklahoma opened up oil ...
*
Roi Et Province, a province in Thailand. The name is literally 101 in Thai language.
* An
HTTP status code
This is a list of Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, ...
indicating that the server is switching protocols as requested by the client to do so.
* For a new
checking account
A transaction account, also called a checking account, chequing account, current account, demand deposit
Demand deposits or checkbook money are funds held in demand accounts in commercial banks. These account balances are usually considered m ...
in the US, the number of the first
check
Check or cheque, may refer to:
Places
* Check, Virginia
Arts, entertainment, and media
* ''Check'' (film), a 2021 Indian Telugu-language film
* ''The Checks'' (episode), a 1996 TV episode of ''Seinfeld''
Games and sports
* Check (chess), a thr ...
.
* A term used to define the number of keys on a
standard 101 key computer keyboard
A computer keyboard is a peripheral input device modeled after the typewriter keyboard which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches. Replacing early punched cards and paper tape technology ...
* 101 is the main Police Emergency Number in
Belgium
Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to th ...
.
*
101 is the
Single Non-Emergency Number (SNEN) in some parts of the UK, a telephone number used to call emergency services that are urgent but not emergencies. 101 is now available across all areas of England and Wales.
* iCar 101 is a roadable aircraft design concept.
*
''101 Dalmatians''
* The
Zastava 101 101 may refer to:
* 101 (number), the number
* AD 101, a year in the 2nd century AD
* 101 BC, a year in the 2nd century BC
It may also refer to:
Entertainment
* 101 (album), ''101'' (album), a live album and documentary by Depeche Mode
* 101 ( ...
is a compact car by the former Yugoslav automaker.
*
Highways numbered 101, the longest and most well-known of which are
BR-101
The BR-101 (also called ''Translitorânea'' (transcoastal), officially named ''Rodovia Governador Mário Covas''.[U.S. Route 101
U.S. Route 101, or U.S. Highway 101 (US 101), is a north–south United States Numbered Highway that runs through the states of California, Oregon, and Washington, on the West Coast of the United States. It is also known as (The Royal Roa ...](_blank)
.
*
''101'', a Depeche Mode album
* Vault 101 is the starting area of ''
Fallout 3
''Fallout 3'' is a 2008 action role-playing game developed by Bethesda Game Studios and published by Bethesda Softworks. The third major installment in the ''Fallout'' series, it is the first game to be developed by Bethesda after acquiring ...
''
* Lebanese Red Cross EMS Center at Spears is coded 101.
* 101 is the identifying number of several infantry units in various militaries across the world, such as the American and Israeli paratrooper brigades.
* 101 was the tail number of a Polish Air Force
Tu-154
The Tupolev Tu-154 (russian: Tyполев Ту-154; NATO reporting name: "Careless") is a three-engined, medium-range, narrow-body airliner designed in the mid-1960s and manufactured by Tupolev. A workhorse of Soviet and (subsequently) Russian ...
, which crashed on 10 April 2010 whilst on its final approach to
Smolensk North Airport
Smolensk North Airport (russian: военный аэродром "Смоленск-Северный", "Smolensk North Military Aerodrome") is a decommissioned military airbase in Smolensk Oblast, Russia, located 4 km north of the city of ...
killing all aboard including president
Lech Kaczyński
Lech Aleksander Kaczyński (; 18 June 194910 April 2010) was a Polish politician who served as the city mayor of Warsaw from 2002 until 2005, and as President of Poland from 2005 until his death in 2010. Before his tenure as president, he prev ...
and his wife. See
2010 Polish Air Force Tu-154 crash
On 10 April 2010, a Tupolev Tu-154 aircraft operating Polish Air Force Flight 101 crashed near the Russian city of Smolensk, killing all 96 people on board. Among the victims were the president of Poland, Lech Kaczyński, and his wife, Maria, ...
.
* "l'ordre des Piliers du 101" is an important student association in
Belgium
Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to th ...
since 1977.
* ''
The Wonderful 101
is an action-adventure game developed by PlatinumGames and published by Nintendo for the Wii U. The game was directed by Hideki Kamiya and produced by Atsushi Inaba; the pair also worked together on the ''Viewtiful Joe'' series and ''Ōkami''. It ...
''
* Korean reality girl group survival show ''
Produce 101
''Produce 101'' is a reality television talent competition franchise created by South Korean entertainment conglomerate CJ E&M, based around the formation of a K-pop girl group or boy group. The format is noted for having no panel of judges, empl ...
''
* TV show ''
Zoey 101
''Zoey 101'' is an American comedy drama television series created by Dan Schneider for Nickelodeon. It aired from January 9, 2005, to May 2, 2008.
It focuses on the lives of Zoey Brooks (Jamie Lynn Spears), her brother Dustin (Paul Butcher (act ...
''
* In
Hinduism
Hinduism () is an Indian religion or '' dharma'', a religious and universal order or way of life by which followers abide. As a religion, it is the world's third-largest, with over 1.2–1.35 billion followers, or 15–16% of the global p ...
, 101 is a lucky number.
* The house number of
Samson en Gert
''Samson & Gert'' is a Flemish children's television series produced by Eline van Noppen, centered on the talking dog Samson and his owner Gert. In its entire run, the show was originally aired on TV1 from Christmas Day 1989 until 1 December 19 ...
in the eponymous Belgian kids' television show.
References
* Wells, D. ''
The Penguin Dictionary of Curious and Interesting Numbers
''The Penguin Dictionary of Curious and Interesting Numbers'' is a reference book for recreational mathematics and elementary number theory written by David Wells. The first edition was published in paperback by Penguin Books in 1986 in the UK, a ...
'' London: Penguin Group. (1987): page 133.
{{DEFAULTSORT:101 (Number)
Integers