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'29' ('twenty-nine') is the natural number following 28 and preceding 30.

Cardinal	29 twenty-nine
Ordinal	29th twenty-ninth
Factorization	''prime''
Divisors	1, 29
Roman numeral	XXIX
Binary	11101
Hexadecimal	1D

Contents

In mathematics

In science

Astronomy

In other fields

Historical years

References

External links

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 $3n\; -\; 1$. Since 18! + 1 is a multiple of 29 but 29 is not one more than a multiple 18, 29 is a Pillai 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 $x^2\; +\; y^2\; +\; z^2\; =\; 3xyz$: {2, 5, 29}, {2, 29, 169}, {5, 29, 433}, {29, 169, 14701}, etc.
29 is a Perrin number, preceded in the sequence by 12, 17, 22.

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 days February has in leap years.

★ The number of bones in a human skull.

★ Kevin Harvick's NASCAR racing number.

★ The number of letters in the Turkish, Finnish, Faroese 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.

★ The number of NHL goaltender, Martin Gerber.

★ A song by Billy Cobham.

★ An album by Ryan Adams.

★ The number of professional baseball player Bret Boone.

Historical years

'29 A.D.', 29 B.C., 1929, 2029, etc.

References

★ Prime Curios! 29 from the Prime Pages

External links

★ On the number 29 at Wisdom Portal