29 (number)
Encyclopedia : 2 : 29 : 29N : 29 (number)
29 (twenty-nine) is the natural number following 28 and preceding 30.
| Cardinal | 29 twenty-nine |
| Ordinal | 29th twenty-ninth |
| Factorization | prime |
| Roman numeral | XXIX |
| Binary | 11101 |
| Hexadecimal | 1D |
Contents
In mathematics
It is the tenth prime number, and also the third primorial prime, the next prime number as well as primorial prime being thirty-one, with which it comprises a twin 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].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^2 + y^2 + z^2 = 3xyz]: , , , , etc.
In science
- The atomic number of copper
Astronomy
- Messier object M29, a magnitude 9.0 open cluster in the constellation Cygnus
- The New General Catalogue [object] NGC 29, a spiral galaxy in the constellation Andromeda
- The Saros [number] of the solar eclipse series which began on -1881 March 1 and ended on -583 April 19. The duration of Saros series 29 was 1298.1 years, and it contained 73 solar eclipses.
- The Saros [number] of the lunar eclipse series which began on -1814 July 21 and ended on -317 January 5. The duration of Saros series 29 was 1496.5 years, and it contained 84 lunar eclipses.
- The lunar month is very close to twenty-nine days.
In other fields
Twenty-nine is:- The number of bones in a normal human skull.
- The number of days February has on leap years.
- The number of letters in the Finnish and Norwegian alphabets.
- The designation of Interstate 29, a U. S. freeway that runs from Missouri to North Dakota.
- In the name of the town Twentynine Palms, California, also the name of the adjoining Marine Corps base, affectionately referred to by Marines as "Twentynine Stumps".
- The number of suras in the Qur'an that begin with muqatta'at
- The highest possible score in a hand of Cribbage.
- A Rubik's Cube can always be solved in 29 moves or less.
- The most dangerous bus in London according to police statistics.
- The number of NHL goaltender, Martin Gerber
- A song by Billy Cobham
- An album by Ryan Adams.
Historical years
29 A.D., 29 B.C., 1929, 2029, etc.External link
- [On the number 29] at Wisdom Portal
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