101 (number)

101 (one hundred [and] one) is the natural number following 100 and preceding 102. In British English it is pronounced "one/a hundred and one", in American English "one/a hundred one", or "one oh one" in both.

← 100 102 → 101
← 100 101 102 103 104 105 106 107 108 109 → List of numbers — Integers ← 100 110 120 130 140 150 160 170 180 190 →
Cardinal	one hundred [and] one
Ordinal	101st (one hundred [and] first)
Numeral system	101
Factorization	prime
Prime	26th
Divisors	1, 101
Roman numeral	CI
Binary	11001012
Octal	1458
Duodecimal	8512
Hexadecimal	6516

Contents 1 Colloquial 2 In mathematics 3 In science 3.1 In astronomy 4 In other fields 5 In books 6 In film 7 In music 8 In television 9 In sports 10 See also 11 References

Colloquial

As suffix, such as "knitting 101", the term denotes the most basic level of introduction to a subject, from the practice in US colleges of numbering courses, starting at 101.

In mathematics

101 is the 26th prime number and a palindromic number (therefore also a palindromic prime). The next prime is 103, with which it comprises a twin prime (making 101 a Chen prime). Because the period length of its reciprocal is unique among primes, 101 is a unique prime. 101 is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.

101 is the sum of five consecutive primes (13 + 17 + 19 + 23 + 29). Given 101, the Mertens function returns 0. 101 is the fifth alternating factorial.

101 is a centered decagonal number.

For a 3-digit number in base 10, this number has a relatively simple divisibility test. The 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 1000a + 100b + 10a + b (where a and b are integers from 0 to 9), such as 3232 or 9797, or of the form 100b + b, such as 707 and 808, then the number is divisible by 101. This might not be as simple as the divisibility tests for numbers like 3 and 5, and it might not be terribly practical, but it is simpler than the divisibility tests for other 3-digit numbers.

On the seven-segment display of a calculator, 101 is both a strobogrammatic prime and a dihedral prime.

In science

• In mineralogy, a Miller index 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).
• The atomic number of mendelevium, an actinide.

In astronomy

• The Asteroid 101 Helena.
• The Messier object M101, a magnitude 8.5 spiral galaxy in the constellation Ursa Major, also known as the Pinwheel Galaxy
• The New General Catalogue object NGC101, a magnitude 12.9 spiral galaxy in the constellation Sculptor

In other fields

101 is also:

• Taipei 101 in Taipei, Taiwan, one of the world's tallest skyscrapers at 509.2 m (1,671 ft) and 101 floors.
• "Shanghai 101", the Shanghai World Financial Center's nickname in Chinese, the People's Republic of China's tallest building at 492 m (1,614 ft) and 101 floors.
• Marina 101 in Dubai, United Arab Emirates is a 412 m (1,352 ft) tall supertall skyscraper with 101 floors under construction.
• 101 Ranch Oil Company
• 101st kilometre, a condition of release from the Gulag in the Soviet Union
• Brendan's 101 is a historic cafe in Rowayton, CT. Which has served as the towns first library (circa 1880) and first community art center. It serves organic foods and all natural ice cream year round.
• Land Rover 101 Forward Control
• 101 Holidays is a website providing travel recommendations by the UK travel writers David Wickers and Mark Hodson.
• Martin 101 is a worldwide model, singer and artist.
• STS-101 Space Shuttle Atlantis mission launched May 19, 2000
• U.S. Route 101 runs from California to Washington
• Unit 101 of the Israeli Defense Forces.
• 101 is the HTTP status code indicating that a client should switch protocols (e.g. to HTTPS)
• A beginning-level or basic course number taught at colleges and universities in Australia, Canada, South Africa, and the United States. An example would be English 101, which may be a remedial English. At universities with four-digit course numbers, the equivalent course number is 1001 or 1010. This usage is not common in the United Kingdom.
• An introduction or basic overview to a topic. By extension, it is informally used elsewhere to indicate things that are meant for beginners, or a crash course.
• A proposed skyscraper is planned for 101 Clarendon Street in Boston
• DBAG 101s are a class of German electric locomotives.
• For new (US) checking accounts, the default number for the first check.
• In DisneySpeak, a ride breakdown in a disney theme park (an indirect reference to the US Route 101)
• Radio stations such as WCBS-FM (101.1), New York, and New Jersey 101.5
• The (minimum) number of keys on a standard computer keyboard.
• The 101st Airborne Division (Air Assault)—nicknamed the “Screaming Eagles”—is an airborne division of the United States Army primarily trained for air assault operations
• The Crusader 101 was an electrically-operated toy car introduced in 1964 by the Deluxe Reading Corporation of Elizabethtown, New Jersey, produced through 1966
• The emergency telephone number for medical emergencies in Israel
• The emergency telephone number for the fire brigade in India.
• The emergency telephone number for the police in Argentina.
• The emergency telephone number for the police in Belgium.
• The One Hundred First United States Congress met from January 3, 1989 to January 3, 1991 during the first two years of the President George H. W. Bush administration
• The Orbiter Vehicle Designation for Shuttle Enterprise
• The R101, a British airship, which crashed in 1930.
• The Single Non-Emergency Number (SNEN), a new flat-rate telephone number being rolled out across the United Kingdom, intended as an easy to remember number, for non emergency calls to the police on occasions when dialing 999 is not appropriate. (official site)
• The Statue of Liberty stands 101 feet tall from base to torch
• The trick-taking card game 101, in which the seniority of cards is: Five, Jack, Joker, Ace of Hearts, Ace of Trumps, High Red, Low Black.
• The year AD 101 or 101 BC

In books

• According to Books in Print, 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 term when referring to "a 101 document" what is usually referred to as a statistical survey or overview of some topic.
• Room 101 in George Orwell's novel Nineteen Eighty-Four.
• The 101 Ranch written by Ellsworth Collings in collaboration with Alma Miller England, narrates the history of the Miller Brothers 101 Ranch
• The Hundred and One Dalmatians, or "The Great Dog Robbery" is a 1956 children's novel by Dodie Smith
• 101 Philosophy Problems and 101 Ethical Dilemmas, both by Martin Cohen, are two introductions to philosophy that playfully adapt the friendly '101' marketing concept for a more serious pedagogical purpose.
• The Professors: The 101 Most Dangerous Academics in America is a 2006 book by David Horowitz
• The Secret Agent on Flight 101 is Volume 46 in the original The Hardy Boys book series
• According to the New Oxford American Dictionary "101" is an adjective, describing a course of education, either imagined or real, in basic knowledge. For example "stuff that you should learn in Anatomy 101"

In film

• "Neo's number" in the 1999 sci-fi action movie The Matrix, according to one of the producers in The Matrix Revisited. It is the number on numerous significant doors in the movie; for example it is Neo's flat number at the beginning of the movie.
• 101 Reykjavík is a 2000 film set in Reykjavík, Iceland based on a book of the same name by Hallgrímur Helgason
• Arnold Schwarzenegger's terminator model in The Terminator and in Terminator 2 was a T-800 Model 101.
• Channel 101 is a short film festival in Los Angeles with formats of a pilot under five minutes in length
• Life 101 is a 1995 film, starring Corey Haim and Ami Dolenz
• Occupation 101 a documentary film about the life of Palestinians under the Israeli occupation.
• One Hundred and One Dalmatians by Dodie Smith (and the various movie versions thereof).
• Bill's room number in Kill Bill
• Sex and Death 101 a dark comedy movie starring Winona Ryder from 2007

In music

• "Back to the 101" is a song by Albert Hammond, Jr.
• "Murder 101" is a song by The Wallflowers
• 101 is a live album and documentary by Depeche Mode released in 1989
• 101 Strings was a term for an easy listening symphonic music organization
• Gangbangin 101 is a song by Snoop dogg
• Highway 101 is an American country music band
• Punk Rock 101 is a song by Bowling For Soup
• The 101'ers were a London rock band from the 1970s, notable as being the band that Joe Strummer left to join The Clash
• Official Live: 101 Proof is a live album by Pantera

In television

• 101 Dalmatians: The Series. It is a spin off from the 1961 movie of the same name
• Room 101, a BBC comedy television series, named after the feature in George Orwell's novel 1984.
• The 101, an in-house channel on DirecTV's satellite service
• Zoey 101 is an American live-action situation comedy television series that is a TEENick show on Nickelodeon, which debuted in 2005, starring Jamie Lynn Spears
• 101 Was also a Robot built for the UK TV series Robot Wars, supposedly costing only £1.01 to build
• The Six Million Dollar Man aired for 101 episodes on ABC from 1974 to 1978

In sports

• Buster Martin trained twice a week at his boxing club in Britain at age 101
• The 2005 World Series between the Chicago White Sox and Houston Astros was the 101st Fall Classic
• The highest number used to win a Formula 1 Grand Prix (Alberto Ascari 1953 German GP)

See also

• List of highways numbered 101

References

• Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): page 133

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