127 (number)
| 127 | |
|---|---|
| Cardinal | one hundred [and] twenty-seven |
| Ordinal | 127th (one hundred [and] twenty-seventh) |
| Factorization | prime |
| Prime | 31st |
| Roman numeral | CXXVII |
| Binary | 11111112 |
| Octal | 1778 |
| Duodecimal | A712 |
| Hexadecimal | 7F16 |
127 (one hundred [and] twenty-seven) is the natural number following 126 and preceding 128.
Contents |
In mathematics
- As a Mersenne prime, 127 is related to the perfect number 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 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. Because the next odd number, 129, is a semiprime, 127 is a Chen prime. 127 is greater than the arithmetic mean of its two neighboring primes, thus it's a strong prime.
- 127 is a centered hexagonal number.
- It is the 7th Motzkin number.
- It is a nice Friedman number 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
- USS Admiral W. S. Sims (AP-127) was a United States Navy transport ship
- USS Allendale (APA-127) was a United States Navy Haskell-class attack transport ship
- USS Alnitah (AK-127) was a United States Navy Crater-class cargo ship in World War II
- USS Raccoon (IX-127), was a United States Navy Armadillo-class tanker
- USS Tumult (AM-127) was a United States Navy Auk-class minesweeper for removing mines from minefields
In transportation
- The small Fiat 127 automobile
- London Buses route 127 is a Transport for London contracted bus route in London
- U.S. Route 127 runs from Grayling, Michigan to Chattanooga, Tennessee. The Highway 127 Corridor Sale is an outdoor 4-day second-hand sale along U.S. Route 127
- Highway 127 in Ontario, Canada
- STS-127 was a Space Shuttle Endeavour mission to the International Space Station which launched on June 15, 2009
In other fields
127 is also:
- 127 Hours is a film released in 2010
- The year AD 127 or 127 BC
- 127 AH is a year in the Islamic calendar that corresponds to 744 – 745 CE
- 127 Johanna, a Main belt asteroid
- 127 film, a film format
- The atomic number of Unbiseptium, an element that has not yet been discovered
- The LZ 127 Graf Zeppelin, a dirigible
- Sonnet 127 by William Shakespeare
- 127th Street Ensemble 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
See also
References
- Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 136 - 138