14 (number)
14 (fourteen) is the natural number following 13 and preceding 15.
In mathematics
Fourteen is a composite number, its proper divisors being 1, 2 and 7.
In base fifteen and higher bases (such as hexadecimal), fourteen is represented as E.
Fourteen is the sum of the first three squares, which makes it a square pyramidal number.
This number is the lowest even n for which the equation φ(x) = n has no solution, making it the first even nontotient (see Euler's totient function). It is a Catalan number.
Take a set of real numbers and apply the closure and complement operations to it in any possible sequence. At most 14 distinct sets can be generated in this way. This holds even if the reals are replaced by a more general topological space.
Fourteen is a Keith number in base 10: 1, 4, 5, 9, 14...
Fourteen is an open meandric number.
In other fields
Fourteen is:
- The atomic number of silicon.
- The upper limit of pH scale.
- The number of days in a fortnight.
- In traditional British units of weight, the number of pounds in a stone.
- A number 'encoded' in a lot of the music of Johann Sebastian Bach. Bach may have considered this number a sort of signature, since given A = 1, B = 2, C = 3, etc., then B + A + C + H = 14 and J + S + B + A + C + H = 41.
- The number of points outlined by president Woodrow Wilson for reconstructing a new Europe following World War I, see Fourteen Points.
- Among neo-Nazis to signify the "14 words", "We must secure the existence of our people and a future for white children", attributed to David Lane.
- An unlucky number in China because it is homonymous with ???? which means "must die".
- The number of a Mexican street gang, the Norteños. It designates N, the fourteenth letter of the alphabet, which stands for "North".
- The number of legs on a pillbug, as well as on Hallucigenia.
- Historical years: 14 A.D., 14 B.C., or 1914
- A common designation for the thirteenth floor in many buildings for superstitious reasons
- The G-14 is a union of fourtien football clubs.
- In rugby union the right wing wears the 14 shirt.
- The number of fonts included in a standard installation of Adobe Acrobat or Acrobat Reader (called "Base 14 fonts"). This set is the same as Base 13 fonts with the addition of Zapf Dingbats.
