ⓘ 127 (number)
 It is the 7th Motzkin number.
 127 is the smallest odd number that cant be written in the form p + 2 x for p=prime number and x=integer, since 127  2 0 = 126, 127  2 1 = 125, 127  2 = 123, 127  2 3 = 119, 127  2 4 = 111, 127  2 5 = 95, and 127  2 6 = 63 are all composite numbers.
 127 is also a cuban prime of the form p = x 3 − y 3 / x − y {\displaystyle p=x^{3}y^{3}/xy}, x = y + 1 {\displaystyle 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 is a strong prime.
 It is the first nice Friedman number in base 10, since 127 = 1 + 2 7, as well as binary since 1111111 = 1 + 1 111  1 * 1.
 127 is the smallest prime that can be written as the sum of the first two or more odd primes: 127 = 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29.
 127 is the sum of the sums of the divisors of the first 12 positive integers.
 127 is a centered hexagonal number.
 127 is an isolated prime where neither p2 nor p+2 are prime.
 As a Mersenne prime, 127 is related to the perfect number 8128. 127 is also an exponent for another Mersenne prime 2 127  1, which was discovered by Edouard Lucas in 1876, and held the record for the largest known prime for 75 years  it is the largest prime ever discovered by hand calculations, as well as the largest known double Mersenne prime. Furthermore, 127 is equal to 2 7  1, and 7 is equal to 2 3  1, and 3 is the smallest Mersenne prime, this makes 7 the smallest double Mersenne prime and 127 the smallest triple Mersenne prime.
 127 is a palindromic prime in nonary and binary.
1. In the military
 USS Alnitah AK127 was a United States Navy Crater class cargo ship in World War II
 USS Admiral W. S. Sims AP127 was a United States Navy transport ship
 USS Tumult AM127 was a United States Navy Auk class minesweeper for removing naval mines
 USNS Mission San Luis Obispo TAO127 was a Mission Buenaventura class fleet oilers during World War II
 USS Allendale APA127 was a United States Navy Haskell class attack transport
 USS Raccoon IX127 was a United States Navy Armadillo class tanker
2. In transportation
 The small Fiat 127 automobile
 London Buses route 127 is a Transport for London contracted bus route in London
 127 is the number of many roads, including U.S. Route 127
 STS127 was a Space Shuttle Endeavour mission to the International Space Station which launched on June 15, 2009
3. In other fields
127 is also:
 The year AD 127 or 127 BC
 The highest signed 8bit integer, using twos complement
 127 Hours is a film released in 2010
 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
 Sonnet 127 by William Shakespeare
 The nonprintable "Delete" DEL control character in ASCII.
 The atomic number of Unbiseptium, an element that has not yet been discovered
 127 Johanna, a Main belt asteroid
 127 AH is a year in the Islamic calendar that corresponds to 744 – 745 CE
 127th Street Ensemble was a troupe of AfricanAmerican actors which included Tupac Amaru Shakur
 The LZ 127 Graf Zeppelin, a dirigible
 127 film, a film format

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