29 (number)

Mathematics

• It is the tenth prime number, and also the fourth primorial prime.
• It forms a twin prime pair with thirty-one, which is also a primorial prime. Twenty-nine is also the sixth Sophie Germain prime.
• It is also the sum of three consecutive squares, 2² + 3² + 4².
• It is a Lucas prime, a Pell prime, and a tetranacci number.
• It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. 29 is also the 10th supersingular prime.
• None of the first 29 natural numbers have more than two different prime factors. This is the longest such consecutive sequence.
• 29 is a Markov number, appearing in the solutions to x + y + z = 3xyz:,,,, etc.
• 29 is a Perrin number, preceded in the sequence by 12, 17, 22.
• 29 is the smallest positive whole number that cannot be made from the numbers, using each exactly once and using only addition, subtraction, multiplication, and division.
• It is the number of pentacubes if reflections are considered distinct.

  Religion

• The Bishnois community follows 29 principles. Guru Jambheshwar had laid down 29 principles to be followed by the sect in 1485 A.D. In Hindi, Bish means 20 and noi means 9; thus, Bishnoi translates as Twenty-niners.
• The number of suras in the Qur'an that begin with muqatta'at.

  Science and astronomy

• The atomic number of copper.
• Messier object M29, a magnitude 6.6 open cluster in the constellation Cygnus.
• The New General Catalogue NGC 29, a spiral galaxy in the constellation Andromeda.
• The lunar month is very close to twenty-nine days.
• Saturn requires over 29 years to orbit the Sun.
• The number of days February has in leap years.

  Language and literature

• The number of letters in the Turkish, Finnish, Swedish, Danish and Norwegian alphabets
• The number of Knuts in one Sickle in the fictional currency in the Harry Potter novels

  Geography

• In the name of the town Twentynine Palms, California
• The number of the French department of Finistère

  Military

• 29th Regiment of Foot, a former regiment in the British Army
• Marine Corps Air Ground Combat Center Twentynine Palms, affectionately referred to by Marines as "Twentynine Stumps".
• Boeing B-29, a large bomber

  Music and entertainment

• "$29.00" is a song on the album Blue Valentine by Tom Waits.
• 29, an album by Ryan Adams.
• "No. 29", a song about a washed-up high school football star from the album Exit 0 by Steve Earle.
• The track from which the Chattanooga Choo Choo train departs in the Glenn Miller song.
• The number of attributes existing according to The Strokes in "You Only Live Once".
• A track from Bon Iver's album, 22, A Million, all tracks being numerically themed.

  Sport

• The 29er sailing skiff is a high-performance two-handed yacht.
• A 29er is a mountain bike with 29-inch wheels.
• 29 is the highest possible score in a hand of Cribbage or Khanhoo.

  History

• The Twenty-nine is often used in New Zealand for the missing miners and contractors believed to have been killed in the Pike River Mine disaster in November 2010.