15 (number) Details, Meaning 15 (number) Article and Explanation Guide

15 (number) Guide, Meaning , Facts, Information and Description

15 (fifteen) is the natural number following 14 and preceding 16.

Fifteen is a triangular number and a hexagonal number, and the 4th Bell number. Fifteen is the double factorial of 5. It is a composite number; its proper divisors being 1, 3 and 5. With only two exceptions, all prime quadruplets enclose a multiple of 15, with 15 itself being enclosed by the quadruplet (11, 13, 17, 19).

In hexadecimal, as well as all higher bases, fifteen is represented as F.

Fifteen is the magic constant of a 3 by 3 magic square:

Age 15 is:

The age of a quinceañera, a Hispanic girl celebrating her fifteenth birthday.
The age for obtaining a driver's (or learner's) permit in jurisdictions where the age for a driver's license is sixteen.

Fifteen is:

The atomic number of phosphorus
The number of days in each of the 24 cycles of the Chinese calendar.
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 number of players on a rugby union team.
- In rugby union the full back wears the 15 shirt.
The number of checkers each side has in the beginning of a backgammon game.
Fifteen, a television program.
A restaurant in London, built by celebrity chef Jamie Oliver
In the United States, the customary percentage to tip a waitress in a restaurant by one or two guests
The number of balls in the eight ball variant of billiards
The number of function keys on most Mac keyboards
Historical years: 15 A.D., 15 B.C, or 1915

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