('''fifteen''') is the Natural Number following 14 and preceding 16 . In English, it is the smallest integer with seven letters in its spelled out name.
Fifteen is a Triangular Number and a Hexagonal Number , a Pentatope Number , and the 4th Bell Number . Fifteen is the Double Factorial of 5. It is a Composite Number ; its proper Divisor s being , and . With only two exceptions, all Prime Quadruplet s enclose a multiple of 15, with 15 itself being enclosed by the quadruplet (11, 13, 17, 19). 15 is also the number of Supersingular Prime s.
In Hexadecimal , as well as all higher bases, fifteen is represented as F.
Fifteen is the Magic Constant of the unique order-3 Normal Magic Square :
15 is the smallest number that can be factorized using Shor's Quantum Algorithm .
There are fifteen solutions to Znám's Problem of length 7.
is:
- The age of a Quinceañera , a Hispanic girl celebrating her fifteenth birthday. Thus, Spanish bingo callers might refer to the number 15 as ''la niña bonita'' (the beautiful girl).
- The age for obtaining a driver's (or learner's) permit in jurisdictions where the age for a driver's license is Sixteen .
- Under certain circumstances one can be sent to prison to await trial at the age of 15
is:
- 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 '15 refers to the first Jacobite Rising in Great Britain in 1715.
- The number of Checkers each side has in the beginning of a Backgammon game.
- The 15 Puzzle .
- '' 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
- ''Fifteen men on a dead man's chest''
- The number of function keys on most Mac keyboards
- The name of a modern punk band, Fifteen (band) , with lead singer Jeff Ott .
- The number of years of marriage celebrated with crystal
- The years: , 15 B.C. , or 1915
- The number of letters in the words "uncopyrightable" and " Dermatoglyphics ", which are the longest words there are without repeating a letter.
- One of the " Lost Numbers " on the television show, Lost , along with 4 , 8 , 16 , 23 , and 42 .
- The number of completed, numbered symphonies and string quartets by Dmitri Shostakovich
- A film rating and age limit on viewing given by the British Board Of Film Classification
- The number of The Devil in the major arcana of Tarot cards.
- The number to dial for SAMU in case of an emergency in France .
- The number of minutes in 1/4 of an hour, 15 min past or before an o'clock is often known as 'Quarter Past' and 'Quarter To' respectivley.
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