29 (number)
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29 (twenty-nine) is the natural number following 28 and preceding 30.
| Cardinal | twenty-nine |
| Ordinal | twenty-ninth |
| Factorization | prime |
| Roman numeral | XXIX |
| Binary | 11101 |
| Hexadecimal | 1D |
In mathematics
It is the tenth prime number, and also the third primorial prime, the next prime number as well as primoral 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 squares, 22 + 32 + 42. It is a Lucas number, a Pell number and a tetranacci number.
None of the first 29 natural numbers have more than two different prime factors. This is the longest such consecutive sequence.
In science
- The atomic number of copper
In astronomy,
- Messier object M29, a magnitude 9.0 open cluster in the constellation Cygnus
- The New General Catalogue object (http://www.ngcic.org/) NGC 29, a spiral galaxy in the constellation Andromeda
- The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) 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 (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) 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 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.
- Historical years: 29 A.D., 29 B.C., or 1929
- A Rubik's Cube can always be solved in 29 moves or less.da:29 (tal)
es:Veintinueve eo:Dudek naŭ fr:29 (nombre) ko:29 ia:29 it:Ventinove he:29 (מספר) nl:29 (getal) ja:29 no:29 (tall) pt:Vinte e nove sv:29 (tal) zh:29