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.[6]
29 is the smallest positive whole number that cannot be made from the numbers {1, 2, 3, 4}, using each exactly once and using only addition, subtraction, multiplication, and division.[7]
29 is the number of
pentacubes if reflections are considered distinct.
The 29th dimension is the highest dimension for
compact hyperbolic Coxeter polytopes that are bounded by a fundamental
polyhedron, and the highest dimension that holds arithmetic discrete groups of reflections with noncompact unbounded fundamental polyhedra.[8]
Religion
The
Bishnois community follows 29 principles.
Guru Jambheshwar had laid down 29 principles to be followed by the sect in 1485 A.D. In Hindi, Bish means 20 and noi means 9; thus, Bishnoi translates as Twenty-niners.
The Twenty-nine is often used in
New Zealand for the missing miners and contractors believed to have been killed in the
Pike River Mine disaster in November 2010.
^Caroline Finkel, Osman's Dream. New York: Basic Books (2006): xv. "The modern Turkish alphabet has 29 letters, of which three vowels and three consonants are unfamiliar to those who do not know the language, and one consonant is pronounced differently from English."
^Anthony Ham, Miles Roddis & Graeme Cornwallis, Norway. New York: Lonely Planet (2005): 413. "The modern Norwegian alphabet has 29 letters: those used in English, plus the vowels æ, ø and å (which are listed at the end of the alphabet)."
^Stephen F. Tomajczyk, To Be a U.S. Marine. New York: Zenith Imprint (2004): 155. "Twenty-nine stumps—Slang for Twenty-nine Palms Marine Corps Air-Ground Combat Center, located in California's Mojave Desert."
External links
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