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15''
15 (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. more...
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In mathematics
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 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). 15 is also the number of supersingular primes.
15 is the 4th discrete biprime (3.5) and the first member of the (3.q) discrete biprime family. The number proceeding 15; 14 is itself a discrete biprime and this is the first such pair of discrete biprimes. The next example is the pair commencing 21.
The aliquot sum of 15 is 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 12 is also a member of this tree.
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 normal magic square:
 15 is the smallest number that can be factorized using Shor's quantum algorithm.
There are 15 solutions to Znám's problem of length 7.
15 is a repdigit in binary (1111). In hexadecimal, as well as all higher bases, fifteen is represented as F.
In science
The atomic number of phosphorus.;
In religion
There were 15 steps between the Ezrat Nashim and the Courtyard of the Temple in Jerusalem, on which the Levites stood and sang during the offering of sacrifices. Fifteen Psalms (Chapters 120-134), collectively known as the "Songs of Ascent", correspond to the 15 steps on which the Levites stood.;
In the Hebrew numbering system, the number 15 is not written according to the usual method, with the letters that represent "10" and "5" (י-ה, yodh and heh), because those spell out one of the Jewish names of God. Instead, the date is written with the letters representing "9" and "6" (ט-ו, teth and vav);
Passover begins on the 15th day of the Hebrew month of Nisan;
Sukkot begins on the 15th day of the Hebrew month of Tishrei;
Tu Bishvat is a Jewish holiday occurring on the 15th of the 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 month of Adar;
Tu B'Av is a minor Jewish holiday occurring on the 15th day of the Hebrew month of Av;
Read more at Wikipedia.org
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