121 (number)
From Wikipedia, the free encyclopedia
121 is the natural number following 120 and preceding 122.
Cardinal | One hundred [and] twenty-one |
Ordinal | 121st |
Factorization | 112 |
Roman numeral | CXXI |
Binary | 1111001 |
Hexadecimal | 79 |
Contents |
[edit] In mathematics
One hundred twenty-one is a square and is the sum of three consecutive primes (37 + 41 + 43). There are no squares besides 121 known to be of the form 1 + p + p2 + p3 + p4, where p is prime (3, in this case). Other such squares must have at least 35 digits.
There are only two other squares known to be of the form n! + 1, supporting Brocard's conjecture. Another example of 121 being of the few examples supporting a conjecture is that Fermat conjectured that 4 and 121 are the only perfect squares of the form x3 - 4 (with x being 2 and 5, respectively).[1]
It is also a star number and a centered octagonal number.
In base 10, it is a Smith number since its digits add up to the same value as its factorization (which uses the same digits) and as a consequence of that it is a Friedman number. But it can not be expressed as the sum of any other number plus that number's digits, making 121 a self number.
[edit] In the military
- 121st Weather Flight is a subordinate unit of the 113th Wing of the United States Air Force based at Andrews Air Force Base
- EC-121 Warning Star was a US Air Force/US Navy Lockheed airborne early warning radar surveillance aircraft
- Task Force 121 of the United States Joint Task Force special operations
- USNS Mission San Diego (T-AO-121) was a United States Navy Mission Buenaventura Class fleet oilers during World War II
- USS Admiral W. L. Capps (AP-121) was a United States Navy Admiral W. S. Benson-class transport ship during World War II
- USS Bluebird (AMS-121) was a United States Navy Bluebird-class minesweeper
- USS Fresno (CL-121) was a United States Navy Atlanta-class light cruiser ship
- USS Hocking (APA-121) was a US Navy Haskell-class attack transport ship during World War II
- USS Kangaroo (IX-121) was a United States Navy Armadillo-class tanker designated an unclassified miscellaneous vessel during World War II
- USS Montgomery (DD-121) was a United States Navy Wickes class destroyer during World War I
- USS PT-121 was a motor torpedo boat
- USS Rabaul (CVE-121) was a United States Navy Commencement Bay-class escort aircraft carrier during World War II
- USS S-16 (SS-121) was a United States Navy second-group (S-3 or "Government") S-class submarine
- USS Sabik (AK-121) was a United States Navy Crater-class cargo ship during World War II
- USS Swerve (AM-121) was a United States Navy Auk-class minesweeper during World War II
- Marine All Weather Fighter Attack Squadron VMFA(AW)-121 is a United States Marine Corps F/A-18 Hornet squadron based at Marine Corps Air Station Miramar, California
[edit] In TV and radio
- Channel 121 on XM Radio is the Fox News Channel
- Channel 121 on Sirius Satellite Radio is ESPNEWS
- The aircraft emergency frequency radio uses frequencies 121.5 MHz for civilians, and is monitored by United States air traffic control towers
- The TV series Garfield and Friends ran on CBS from 1988 to 1994 for 121 episodes
[edit] In Transportation
- 121st Street (BMT Jamaica Line) station on the BMT Jamaica Line of the New York City Subway
- M-121 state trunkline route in Michigan
- Mohawk Airlines Flight 121, a Martin 404, crashed during takeoff from Rochester-Monroe Airport on July 2, 1963
- N-121 highway in Spain
- National Route 121 in Argentina
- National Route 121 is a Japan national highway
- STS-121 was a Space Shuttle Discovery mission to the International Space Station which launched July 4, 2006
- The Alfa Romeo 121 eight-cylinder, air-cooled, inverted V engine for aircraft use produced in Italy
- The Embraer EMB 121 Xingu, a Brazilian aircraft
- The Iarnród Éireann 121 Class railway locomotive manufactured by EMD, in service on the Irish railway network until 2005
- The Mazda 121 automobile introduced in 1987
- The Mercedes-Benz W120/121 ponton cars produced until 1962
[edit] In other fields
121 is also:
- 121 AH is a year in the Islamic calendar that corresponds to 738 – 739 CE
- 121 Hermione is a large C-type asteroid in the outer main belt
- 121 West Trade also known as the Interstate Tower, is the fifth tallest building in Charlotte, North Carolina
- 121P/Shoemaker-Holt is a periodic comet in our solar system
- Ireland ranks #121 in world population
- Jimmie Hall hit 33 home runs in his rookie year with the Minnesota Twins in 1963, and retired in 1970 with 121 total.
- Sonnet 121 by William Shakespeare
- Strain 121 is a single-celled microbe, of the domain Archaea
- The Stooges song “We Will Fall” includes the lyrics “Don't forget to come. Room 121”
- Former Australian footballer Ron Todd (footballer) with Collingwood, had a league record 121 goals in 1939
- Formerly known as 121Media, Phorm is a digital technology based in London, New York and Moscow
- In the movie “Snakes on a Plane” Eddie Kim arranges for a release of snakes in the cargo hold of South Pacific Air Flight 121, from Honolulu to Los Angeles
- Slang for communicating between two people e.g. "Lets talk one to one" or “Lets make a 121 connection”
- The Electricity emergency telephone number in Egypt
- The “Futuristic Sex Robotz” song “Snakes on a Plane” includes the lyrics “Hop on the plane, Flight 121”
- The 121st Kentucky Derby was won by Thunder Gulch on May 7, 1995
- The 121st Westminster Kennel Club Dog Show was won by Ch. Parsifal di Casa Netzer, a Standard Schnauzer on February 11, 1997
- The name of a song done by Powerline, a fictional singer in A Goofy Movie
- The number for voicemail for mobile phones on the Vodafone network
- The number of points required to win a standard game of Cribbage
- The undiscovered chemical element Unbiunium has the atomic number 121
- The year AD 121 or 121 BC
- There are 121 marble slots on a Chinese checkers board
- Total number of days in the first four months of a leap year
[edit] See also
- List of highways numbered 121
- United States House of Representatives House Resolution 121
- United Nations Security Council Resolution 121
[edit] References
- ^ Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 136