127 (number)
Encyclopedia
127 is the natural number
Natural number
In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...

following 126
126 (number)
126 is the natural number following 125 and preceding 127.-In mathematics:One hundred [and] twenty-six is a pentagonal pyramidal number, and a decagonal number as well as a pentatope number....

and preceding 128
128 (number)
128 is the natural number following 127 and preceding 129.-In mathematics:One hundred [and] twenty-eight is the seventh power of 2. It is the largest number which cannot be expressed as the sum of any number of distinct squares...

.

## In mathematics

• As a Mersenne prime
Mersenne prime
In mathematics, a Mersenne number, named after Marin Mersenne , is a positive integer that is one less than a power of two: M_p=2^p-1.\,...

, 127 is related to the perfect number
Perfect number
In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself . Equivalently, a perfect number is a number that is half the sum of all of its positive divisors i.e...

8128
8128 (number)
8128 is the natural number following 8127 and preceding 8129.It is most notable for being a perfect number, and one of the earliest numbers to be recognized as such. As a perfect number, it is tied to the Mersenne prime 127, 27 − 1, with 26 · yielding 8128...

. 127 is also an exponent for the Mersenne prime 2127 - 1, making 127 a double Mersenne prime. (2127 - 1 was discovered by Edouard Lucas
Edouard Lucas
François Édouard Anatole Lucas was a French mathematician. Lucas is known for his study of the Fibonacci sequence. The related Lucas sequences and Lucas numbers are named after him.-Biography:...

in 1876, and held the record for the largest known prime for 75 years. It's still the largest prime ever discovered by hand calculations.)

• 127 is also a cuban prime of the form , . The next prime is 131, with which it comprises a cousin prime
Cousin prime
In mathematics, cousin primes are prime numbers that differ by four; compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six....

. Because the next odd number, 129, is a semiprime
Semiprime
In mathematics, a semiprime is a natural number that is the product of two prime numbers. The first few semiprimes are 4, 6, 9, 10, 14, 15, 21, 22, 25, 26, ... ....

, 127 is a Chen prime
Chen prime
A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes. The even number 2p + 2 therefore satisfies Chen's theorem....

. 127 is greater than the arithmetic mean of its two neighboring primes, thus it's a strong prime
Strong prime
In mathematics, a strong prime is a prime number with certain special properties. The definitions of strong primes are different in cryptography and number theory.- Definition in cryptography :...

.

• 127 is a centered hexagonal number
Centered hexagonal number
A centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice....

.

• It is the 7th Motzkin number
Motzkin number
In mathematics, a Motzkin number for a given number n is the number of different ways of drawing non-intersecting chords on a circle between n points. The Motzkin numbers have very diverse applications in geometry, combinatorics and number theory...

.

• It is a nice Friedman number
Friedman number
A Friedman number is an integer which, in a given base, is the result of an expression using all its own digits in combination with any of the four basic arithmetic operators and sometimes exponentiation. For example, 347 is a Friedman number since 347 = 73 + 4...

in base 10, since 127 = -1 + 27, as well as binary since 1111111 = (1 + 1)111 - 1 * 1.

## In the military

• USNS Mission San Luis Obispo (T-AO-127) was a Mission Buenaventura Class fleet oilers during World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

• USS Admiral W. S. Sims (AP-127)
USS Admiral W. S. Sims (AP-127)
USS Admiral W. S. Sims was a transport in the United States Navy. She was later renamed USNS General William O. Darby . Later her name was struck and she was known simply by her hull number. In 1981, she was reclassified as IX-510.-As Admiral W. S. Sims:Admiral W. S...

was a United States Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

transport
Transport
Transport or transportation is the movement of people, cattle, animals and goods from one location to another. Modes of transport include air, rail, road, water, cable, pipeline, and space. The field can be divided into infrastructure, vehicles, and operations...

ship
• USS Allendale (APA-127)
USS Allendale (APA-127)
USS Allendale was a Haskell-class attack transport of the US Navy. She was built and used during World War II. She was of the VC2-S-AP5 Victory ship design type...

was a United States Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

Haskell-class attack transports were amphibious assault ships of the United States Navy created in 1944. They were designed to transport 1,500 troops and their combat equipment, and land them on hostile shores with the ships' integral landing craft....

attack transport
Attack transport
Attack Transport is a United States Navy ship classification.-History:In the early 1940s, as the United States Navy expanded in response to the threat of involvement in World War II, a number of civilian passenger ships and some freighters were acquired, converted to transports and given hull...

ship
• USS Alnitah (AK-127)
USS Alnitah (AK-127)
The USS Alnitah was a Crater-class cargo ship in the service of the United States Navy in World War II. Named a spelling variation of the star Alnitak in the constellation Orion, it was the only ship of the Navy to bear this name....

was a United States Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

Crater-class
Crater class cargo ship
Crater-class cargo ship is a category of freighter that was constructed for use by the United States Navy during World War II under Maritime Commission EC2-S-C1 type....

cargo ship
Cargo ship
A cargo ship or freighter is any sort of ship or vessel that carries cargo, goods, and materials from one port to another. Thousands of cargo carriers ply the world's seas and oceans each year; they handle the bulk of international trade...

in World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

• USS Raccoon (IX-127)
USS Raccoon (IX-127)
The second USS Raccoon , an Armadillo-class tanker designated an unclassified miscellaneous vessel, was the second ship of the United States Navy to be named for the raccoon. She was built as the Liberty ship J. C. W. Becham by the Maritime Commission and renamed Raccoon by the Navy on 27 October...

, was a United States Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

The Armadillo class of tankers were those Type Z-ET1-S-C3 Liberty tankers that were commissioned into the United States Navy. They were given the hull classification symbols of unclassified miscellaneous vessels....

• USS Tumult (AM-127)
USS Tumult (AM-127)
USS Tumult was an acquired by the United States Navy for the dangerous task of removing mines from minefields laid in the water to prevent ships from passing....

was a United States Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

Auk-class
Auk class minesweeper
The Auk class were Allied minesweepers serving with the United States Navy and the British Royal Navy during the Second World War. In total, there were 95 Auks built.-Design and development:...

minesweeper
Minesweeper (ship)
A minesweeper is a small naval warship designed to counter the threat posed by naval mines. Minesweepers generally detect then neutralize mines in advance of other naval operations.-History:...

for removing mines from minefields

## In transportation

• The small Fiat 127
Fiat 127
The Fiat 127 is a supermini produced by the Italian automaker Fiat between 1971 and 1983. It was introduced in 1971 as the replacement for the Fiat 850...

automobile
• London Buses route 127 is a Transport for London
Transport for London
Transport for London is the local government body responsible for most aspects of the transport system in Greater London in England. Its role is to implement the transport strategy and to manage transport services across London...

contracted bus route in London
London
London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

• U.S. Route 127
U.S. Route 127
U.S. Route 127 is a long north–south United States highway in the eastern half of the United States. The southern terminus of the route is at U.S. Route 27 in Chattanooga, Tennessee. The northern terminus is at Interstate 75 near Grayling, Michigan...

runs from Grayling, Michigan
Grayling, Michigan
Grayling is a city in the U.S. state of Michigan and the county seat of Crawford County. The population was 1,952 at the 2000 census. Grayling takes its name from the Grayling fish that was once prevalent in its lakes and streams....

to Chattanooga, Tennessee
Chattanooga, Tennessee
Chattanooga is the fourth-largest city in the US state of Tennessee , with a population of 169,887. It is the seat of Hamilton County...

. The Highway 127 Corridor Sale
Highway 127 Corridor Sale
The Highway 127 Corridor Sale is an outdoor second-hand sale held annually for four days beginning the first Thursday in August along U.S. Route 127. The event has been promoted as "The World's Longest Yard Sale."...

is an outdoor 4-day second-hand
Used goods
A second-hand or used good is one that is being purchased by or otherwise transferred to a second or later end user. A used good can also simply mean it is no longer in the same condition as it was when it was first transferred to the current end user...

sale along U.S. Route 127
• Highway 127 in Ontario, Canada
• STS-127
STS-127
STS-127 was a NASA Space Shuttle mission to the International Space Station . It was the twenty-third flight of . The primary purpose of the STS-127 mission was to deliver and install the final two components of the Japanese Experiment Module: the Exposed Facility , and the Exposed Section of the...

was a Space Shuttle Endeavour
Space Shuttle Endeavour
Space Shuttle Endeavour is one of the retired orbiters of the Space Shuttle program of NASA, the space agency of the United States. Endeavour was the fifth and final spaceworthy NASA space shuttle to be built, constructed as a replacement for Challenger...

mission to the International Space Station
International Space Station
The International Space Station is a habitable, artificial satellite in low Earth orbit. The ISS follows the Salyut, Almaz, Cosmos, Skylab, and Mir space stations, as the 11th space station launched, not including the Genesis I and II prototypes...

which launched on June 15, 2009

## In other fields

127 is also:
• 127 Hours
127 Hours
127 Hours is a 2010 biographical adventure drama film co-written, produced and directed by Danny Boyle. The film stars James Franco as mountain climber Aron Ralston, who became trapped by a boulder in Robbers Roost, Utah in April 2003....

is a film released in 2010
127
Year 127 was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Rufus and Squilla...

or 127 BC
127 BC
Year 127 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Ravilla and Cinna...

• 127 AH is a year in the Islamic calendar
Islamic calendar
The Hijri calendar , also known as the Muslim calendar or Islamic calendar , is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to date events in many Muslim countries , and used by Muslims everywhere to determine the proper day on which to celebrate Islamic...

that corresponds to 744
744
Year 744 was a leap year starting on Wednesday of the Julian calendar. The denomination 744 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Europe :* February – Hildeprand succeeds...

– 745
745
Year 745 was a common year starting on Friday of the Julian calendar. The denomination 745 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Asia :* Newly founded Uighur Empire control most of...

CE
Common Era
Common Era ,abbreviated as CE, is an alternative designation for the calendar era originally introduced by Dionysius Exiguus in the 6th century, traditionally identified with Anno Domini .Dates before the year 1 CE are indicated by the usage of BCE, short for Before the Common Era Common Era...

• 127 Johanna
127 Johanna
127 Johanna is a large main-belt asteroid. It has a very dark surface and is probably a primitive composition of carbonates. It was discovered by P. M. Henry on November 5, 1872, and is believed to be named after Joan of Arc.-References:...

, a Main belt asteroid
• 127 film
127 film
127 is a film format for still photography. The image format is usually a square 4×4 cm, but rectangular 4×3 cm and 4×6 cm are also standard. Oddly, C. F. Foth & Co. used 36×24 mm for its first “Derby” model....

, a film format
• The atomic number
Atomic number
In chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. It is conventionally represented by the symbol Z. The atomic number uniquely identifies a chemical element...

of Unbiseptium, an element that has not yet been discovered
• The LZ 127 Graf Zeppelin
LZ 127 Graf Zeppelin
LZ 127 Graf Zeppelin was a German built and operated passenger-carrying hydrogen-filled rigid airship which operated commercially from 1928 to 1937. It was named after the German pioneer of airships, Ferdinand von Zeppelin, who was a Graf or Count in the German nobility. During its operating life,...

, a dirigible
• Sonnet 127
Sonnet 127
Sonnet 127 of SHAKE-SPEARES SONNETS is the first of the Dark Lady sequence , called so because the poems make it clear that the speaker's mistress has black hair and eyes and dark skin...

by William Shakespeare
William Shakespeare
William Shakespeare was an English poet and playwright, widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's national poet and the "Bard of Avon"...

• 127th Street Ensemble
127th Street Ensemble
The 127th Street Repertory Ensemble was a theater group based in Harlem, Manhattan, New York City. The name derives from West 127th Street in Harlem. The most famous member of this ensemble was Tupac Shakur....

was a troupe of African-American actors which included Tupac Amaru Shakur
• In IP (Internet Protocol) Version 4, it is the last Class A network and is also the subnet used for loopback functionality in computer networking
• The highest signed 8 bit integer