127 (number)
From Wikipedia, the free encyclopedia
127 is the natural number following 126 and preceding 128.
| Cardinal | One hundred [and] twenty-seven |
| Ordinal | 127th |
| Factorization | prime |
| Roman numeral | CXXVII |
| Binary | 1111111 |
| Hexadecimal | 7F |
Contents |
[edit] In mathematics
127 is a Mersenne prime, 27 - 1, and as such, in binary it is a repunit prime, a permutable prime and a palindromic prime. This also means it is the largest integer that can be represented by a signed byte.
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 p = (x3 − y3) / (x − y), x = y + 1. 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.
It is the sum of the sums of divisors of the first twelve integers.
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.
[edit] 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
[edit] 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 is a planned Space Shuttle Endeavour mission to the International Space Station planned for early 2009
[edit] In other fields
127 is also:
- The year AD 127 or 127 BC
- 127 AH is a year in the Islamic calendar that corresponds to 744 – 745 CE
- 127 Johanna is a Main belt asteroid
- ASCII and Unicode code point for delete
- A film format: 127 film
- The number of provinces ruled by King Xerxes I, "from India to Ethiopia" (Bible, Esther 1:1)
- The number of sons of Bethlehem at the Census of men of Israel upon return from exile (Bible, Ezra 2:21)
- The maximum measure on a Musical Instrument Digital Interface (MIDI) control
- The atomic number of Unbiseptium, an element that has not yet been discovered
- Moldova ranks #127 in world population
- The LZ 127 Graf Zeppelin was a dirigible
- Sonnet 127 by William Shakespeare
- The TV series Sisters ran on NBC from 1991 to 1996 for 127 episodes
- Channel 127 on Sirius Satellite Radio is Sports Play-by-Play 5
- Channel 127 on XM Radio is CNBC
- 127th Street Ensemble was a troupe of African-American actors which included Tupac Amaru Shakur
- 127 species in the cuckoo bird family, including the road runner
- The 127th Kentucky Derby was won by Monarchos on May 5, 2001
- The Pittsburgh Pirates' 2008 season is the 127th season of baseball in Pittsburgh
- The 127th Westminster Kennel Club Dog Show was won by Ch. Torums Scarf Michael, a Kerry Blue Terrier on February 11, 2003
[edit] See also
[edit] References
- Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 136 - 138
