29 (number)
29 (twenty-nine) is the natural number following 28 and preceding 30.
In mathematics
It is the tenth prime number, and also a 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 a 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 scienceThe atomic number of copper In 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:
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