29 (number)

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

← 20 21 22 23 24 25 26 27 28 29 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	29 twenty-nine
Ordinal	29th twenty-ninth
Factorization	prime
Divisors	1, 29
Roman numeral	XXIX
Binary	11101
Hexadecimal	1D

Contents 1 In mathematics 2 In science 2.1 Astronomy 3 In other fields 4 Historical years 5 References 6 External links

[edit] 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. 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 x² + y² + z² = 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.

Since the greatest prime factor of 29² + 1 = 842 is 421, which is obviously more than 29 twice, 29 is a Størmer number.

[edit] In science

• The atomic number of copper

[edit] 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.

• Saturn requires over 29 years to orbit the Sun.

[edit] In other fields

Twenty-nine is:

• The number of days February has in leap years.
• 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.
• An album by Ryan Adams.
• The track the Chattanooga Choo Choo leaves in the Glenn Miller song.
• 29th Regiment of Foot, a former regiment in the British Army.
• The retired jersey number of Rod Carew

[edit] Historical years

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

[edit] References

• Prime Curios! 29 from the Prime Pages

[edit] External links

• On the number 29 at Wisdom Portal