Fifteen
Fifteen (15, XV) is the
natural number following
fourteen and preceding
sixteen. Fifteen is a
triangular number. It is a
composite number; its proper divisors being
1,
3 and
5. Its factorization is
In hexadecimal, as well as all higher bases, fifteen is represented as F. Fifteen is the magic result of a 3 by 3 magic square:
Fifteen is also:
- The atomic number of phosphorous.
- The number of guns in a gun salute to Army, Air Force and Marine Corps Lieutenant Generals, and Navy and Coast Guard Vice Admirals.
- The designation of Interstate 15, a freeway that runs from California to Montana.
- The age of a quinceañera, a Hispanic girl celebrating her fifteenth birthday.
- The age for obtaining a driver's permit in jurisdictions where the age for a driver's license is sixteen.
- The number of players on a rugby union team.
See also: thirteen,
fourteen, fifteen,
sixteen,
seventeen,
integer,
list of numbers.
This article is about the number. For the year AD 15, see 15. For information on the television program, see Fifteen (TV show)