101 (number)

101 (one hundred [and] one) is the natural number following 100 and preceding 102.
It is variously pronounced "one hundred and one" / "a hundred and one", "one hundred one" / "a hundred one", and "one oh one".

← 100 101 102 →
← 100 101 102 103 104 105 106 107 108 109 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred [and] one
Ordinal	st
Numeral system	101
Factorization	prime
Prime	26th
Divisors	1, 101
Greek numeral	ΡΑ´
Roman numeral	CI
Binary	11001012
Ternary	102023
Senary	2456
Octal	1458
Duodecimal	8512
Hexadecimal	6516

In mathematics

101 is the 26th prime number and a palindromic number (and so a palindromic prime). The next prime is 103, with which it makes a twin prime pair, 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 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 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 or 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).
• In physics and chemistry, the atomic number of mendelevium, an actinide.

In transportation

• Land Rover 101 Forward Control
• STS-101 Space Shuttle Atlantis mission launched May 19, 2000
• U.S. Route 101 runs from California to Washington
• DBAG Class 101 is a class of German electric locomotives.
• OV-101, the Orbiter Vehicle Designation for Shuttle Enterprise
• The R101, a British airship, which crashed in 1930.
• SEPTA Route 101, a light rail line in Suburban Philadelphia.
• 101 series, a Japanese commuter train type
• Zastava Skala 101, nicknamed "Stojadin", Serbian car

Buildings

• A skyscraper planned for 101 Clarendon Street in Boston, Massachusetts.
• Marina 101 in Dubai, United Arab Emirates. a skyscraper with 101 floors under construction (As of May 2009).
• "Shanghai 101", the Shanghai World Financial Center's nickname in Chinese, the tallest building in the People's Republic of China, with 101 floors.
• Taipei 101 in Taipei, Taiwan, a skyscraper with 101 floors.

In radio

• WCBS-FM (101.1), New York
• KRTH (101.1), Los Angeles
• New Jersey 101.5, New Jersey
• B101.1, Philadelphia
• CFMI-FM (101.1), Vancouver

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
• "Murder 101" is a song by Pro-Pain
• 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 the former heavy metal band Pantera released in 1997
• 101 (song), a 1988 song and single by Sheena Easton

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 from a feature of George Orwell's novel Nineteen Eighty-Four.
• The 101 Network, a house channel on DirecTV's satellite service.
• Zoey 101, an American live-action situation comedy television series that is a TEENick show on Nickelodeon, which started in 2005, starring Jamie Lynn Spears.
• The Six Million Dollar Man aired for 101 episodes on ABC from 1974 to 1978.

In sport

• The centenarian Buster Martin trained twice a week at his boxing club in Britain aged 101.
• The 2005 World Series between the Chicago White Sox and Houston Astros was the 101st Fall Classic

Other uses

• Beijing 101
• 101 Ranch Oil Company
• 101st kilometre, a condition of release from the Gulag in the Soviet Union.
• Unit 101 of the Israeli Defense Forces.
• Roi Et Province, a province in Thailand. The name is literally 101 in Thai language.
• An HTTP status code indicating that a client should switch protocols (e.g. to HTTPS).
• The first course in a subject taught at a college or university in Australia, Canada, South Africa, or the United States. By extension, "Topic 101" is used generally to indicate the basics of any subject. This expression is not used in the UK. Used this way, it is always pronounced "one-oh-one".
• For a new checking account in the US, the number of the first check.
• A term used to define the number of keys on a computer keyboard
• The 101st Airborne Division (Air Assault) — nicknamed the "Screaming Eagles" — an airborne division of the United States Army primarily trained for air assault operations.
• The Crusader 101, an electrically-operated toy car.
• An emergency telephone number in Argentina, Belarus, Belgium, India, and Israel.
• 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 Single Non-Emergency Number (SNEN), a telephone number used in some parts of the United Kingdom for telephone calls to services that are urgent but not emergencies.

See also

• List of highways numbered 101

References

• Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): page 133. ISBN 978-0140080292