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examplefarm|date=March 2010two other uses|the number 15|the year|15|other uses|15 (disambiguation)Number|number = 15| range = 10s| cardinal = fifteen| ordinal = th| ordinal text =| numeral =| factorization = smallmath|f= 3 \cdot 5 | prime =| divisor = 1, 3, 5, 15| roman = XV| unicode =| greek prefix =| latin prefix =| bin = 1111| oct = 17| duo = 13| hex = F| misc = Hebrew (language)|Hebrew !!?"? (Tet Vav)Wiktionary|15 15 ( fifteen ) is the natural number following 14 (number)|14 and preceding 16 (number)|16 . In English, it is the smallest natural number with seven letters in its spelled name.
In speech, the numbers 15 and 50 are often confused. When carefully enunciated, they differ in which syllable is stress (linguistics)|stressed : 15 IPA-en|f?f'ti?n| vs 50 IPA-en|'f?fti|. However, in dates such as 1500 ("fifteen hundred") or when contrasting numbers in the teens, the stress generally shifts to the first syllable: 15 IPA-en|'f?fti?n|.
In mathematics
Fifteen is a triangular number , 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 num|1|, num|3 and num|5. 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.
15 is the 4th discrete semiprime (3.5) and the first member of the (3.q) discrete semiprime family. It is thus the first odd discrete semiprime . The number proceeding 15; 14 (number)|14 is itself a discrete semiprime and this is the first such pair of discrete semiprime s. The next example is the pair commencing 21 (number)|21 .
The aliquot sum of 15 is 9 (number)|9 , a square prime 15 has an aliquot sequence of 6 members (15,9,4,3,1,0). 15 is the fourth composite number in the 3-aliquot tree. The abundant number|abundant 12 (number)|12 is also a member of this tree. Fifteen is the aliquot sum of the consecutive 4-power 16, and the discrete semiprime 33.
15 and 16 form a Ruth-Aaron pair under the second definition in which repeated prime factors are counted as often as they occur.
Fifteen is the magic constant of the unique order-3 magic square|normal magic square :
15 is the smallest number that can be factorized using Shor's algorithm|Shor's quantum algorithm .
There are 15 solutions to Znám's problem of length 7.
15 is a repdigit in Binary numeral system|binary (1111). In hexadecimal , as well as all higher bases, fifteen is represented as F.
Group (periodic table)|Group 15 of the periodic table are sometimes known as the " Pnictogens ".
In Pakistan
15 Madadgar is designated as an emergency number in Pakistan , for mobile phones, similar to the international GSM emergency number 112, if 112 is used in Pakistan, then the call is routed to 15. 112 can be used in an emergency even if the phone is locked and does not have a sim-card in it.
In Judaism
In the Hebrew numerals|Hebrew numbering system , the number 15 is not written according to the usual method, with the letters that represent "10" and "5" (?-?, yodh and He (letter)|heh ), because those spell out Names of God in Judaism#Yah|one of the Jewish names of God . Instead, the date is written with the letters representing "9" and "6" (?-?, teth and waw (letter)|vav )
Passover begins on the 15th day of the Hebrew calendar|Hebrew month of Nisan
Sukkot begins on the 15th day of the Hebrew calendar|Hebrew month of Tishrei
Tu Bishvat is a Jewish holiday occurring on the 15th of the Hebrew calendar|Hebrew month of Shevat
Shushan Purim (the day on which Purim is celebrated in Jerusalem and a few other cities in Israel ) occurs on the 15th day of the Hebrew calendar|Hebrew month of Adar
Tu B'Av is a minor Jewish holiday occurring on the 15th day of the Hebrew calendar|Hebrew month of Av (month)|Av
In sports
In all four of the major Gaelic games — hurling , Gaelic football for Gaelic football|men and Ladies' Gaelic football|women , and camogie —each team has 15 players on the field at any given time.
In tennis , the number 15 represents the first point gained in a game.
In rugby union :
* Each team has 15 players on the field at any given time.
* The jersey number 15 is worn by the starting fullback.
* Starting with the 2012–13 series, the IRB Sevens World Series in rugby sevens|rugby union sevens will have 15 "core teams" that participate in each series event.
In College athletics|U.S. college athletics , schools that are members of Division I (NCAA)|NCAA Division I are allowed to provide athletic scholarship s to a maximum of 15 women's basketball players in a given season.
The Squad number|jersey number 15 has been retired by several Major professional sports leagues in the United States and Canada|North American sports teams in honor of past playing greats or other key figures:
* In Major League Baseball :
** The New York Yankees , for Thurman Munson .
* In the National Basketball Association|NBA :
** The Boston Celtics , for List of players in the Naismith Memorial Basketball Hall of Fame|Hall of Famer Tom Heinsohn , who would later serve the team as a head coach and broadcaster.
** The New York Knicks have retired the number twice, both for Hall of Fame players. #15 was first retired for Dick McGuire , who went on to serve the team as head coach and scouting director. The team then reissued the number, presumably with McGuire's blessing, to Earl Monroe , and then retired it a second time for Monroe.
** The Philadelphia 76ers , for Hall of Famer Hal Greer .
** The Portland Trail Blazers , for Larry Steele .
** The Boston Bruins , for Hockey Hall of Fame|Hall of Famer Milt Schmidt .
* In the National Football League|NFL :
** The Green Bay Packers , for Pro Football Hall of Fame|Hall of Famer Bart Starr .
** The Philadelphia Eagles , for Hall of Famer Steve Van Buren .
Age 15
Age 15 is:
The age of a quinceañera , a Hispanic girl celebrating her fifteenth birthday. Thus, Spanish Bingo (U.S.)|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 certain jurisdictions, including some where the age for a driver's license is 16 (number)|sixteen .
In the UK a Minor (law)|minor can be sent to prison to await trial at the age of 15.
In many countries it is the legal age for sexual intercourse . http://www.avert.org/age-of-consent.htm Worldwide Ages of Consent. Avert.org. Retrieved on 2011-11-01.
In the UK it is the legal age to watch a British Board of Film Classification|BBFC "15" rated film in a cinema or purchase a "15" rated film or video game.
Fifteen 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, Marine Corps, and Air Force Lieutenant Generals, and Navy and Coast Guard Vice Admirals.
The designation of Interstate 15 , a freeway that runs from California to Montana .
The designation of U.S. Route 15 , a highway that runs from South Carolina to New York.
The number of checkers each side has at the start of a backgammon game.
The N-puzzle|15 puzzle .
A fifteen (restaurant)|restaurant in London, built by celebrity chef Jamie Oliver
15 minutes of fame
The 15th is a Wire (band)|Wire song
The number of balls in the eight ball variant of billiards
The number of letters in the words "uncopyrightable", " dermatoglyphics ", "misconjugatedly", and "hydropneumatics", which are the longest words in the English language that do not repeat a letter.Citation needed|date=November 2010
15 is one of Mythology of Lost#The numbers|The Numbers – 4, 8, 15, 16, 23, and 42 – featured in Lost (TV series)|Lost .
The number to dial for SAMU in case of an emergency in France.
The number of minutes in one quarter of an hour; 15 minutes past or before an hour is often known as quarter past and quarter to , respectively.
The number of the French department Cantal
The number corresponding to The Devil in tarot cards.
