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. In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 14 (fourteen) is the natural number following 13 and preceding 15. ... 16 (sixteen) is the natural number following 15 and preceding 17. ...

← 10 11 12 13 14 15 16 17 18 19 → Look up nine in Wiktionary, the free dictionary. ... 10 (ten) is an even natural number following 9 and preceding 11. ... 11 (eleven) is the natural number following 10 and preceding 12. ... Look up twelve in Wiktionary, the free dictionary. ... 13 (thirteen) is the natural number following 12 and preceding 14. ... 14 (fourteen) is the natural number following 13 and preceding 15. ... 16 (sixteen) is the natural number following 15 and preceding 17. ... 17 (seventeen) is the natural number following 16 and preceding 18. ... 18 (eighteen) is the natural number following 17 and preceding 19. ... 19 (nineteen) is the natural number following 18 and preceding 20. ... 20 (twenty) is the natural number following 19 and preceding 21. ... List of numbers — Integers This is a list of articles about numbers (not about numerals). ... The integers are commonly denoted by the above symbol. ... 0 10 20 30 40 50 60 70 80 90 → 0 (zero) is both a number and a numerical digit used to represent that number in numerals. ... 10 (ten) is an even natural number following 9 and preceding 11. ... 20 (twenty) is the natural number following 19 and preceding 21. ... 30 (thirty) is the natural number following 29 and preceding 31. ... 40 (forty) is the natural number following 39 and preceding 41. ... 50 (fifty) is the number following 49 and preceding 51. ... 60 (sixty) is the natural number following 59 and preceding 61. ... Look up seventy in Wiktionary, the free dictionary. ... 80 (eighty) is the natural number following 79 and preceding 81. ... 90 (ninety) is the natural number preceded by 89 and followed by 91. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ...
Cardinal	15 fifteen
Ordinal	15th fifteenth
Numeral system	quindecimal
Factorization
Divisors	1, 3, 5, 15
Roman numeral	XV
Roman numeral (Unicode)	XV, xv
Binary	1111
Octal	17
Duodecimal	13
Hexadecimal	F
Hebrew	ט"ו (Tet Vav)

Look up fifteen in
Wiktionary, the free dictionary.

Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set, known as its cardinality. ... In set theory, ordinal, ordinal number, and transfinite ordinal number refer to a type of number introduced by Georg Cantor in 1897, to accommodate infinite sequences and to classify sets with certain kinds of order structures on them. ... A numeral is a symbol or group of symbols, or a word in a natural language that represents a number. ... ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. ... The duodecimal (also known as base-12 or dozenal) system is a numeral system using twelve as its base. ... In mathematics and computer science, hexadecimal, base-16, or simply hex, is a numeral system with a radix, or base, of 16, usually written using the symbols 0–9 and A–F, or a–f. ... The Modern Hebrew language is a Semitic language of the Afro-Asiatic language family. ... Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...

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. A triangular number is the sum of the n natural numbers from 1 to n. ... A hexagonal number is a figurate number that represents a hexagon. ... A pentatope number is a number in the fifth cell of any row of Pascals triangle starting with the 5-term row 1 4 6 4 1 either from left to right or from right to left. ... The Bell numbers, named in honor of Eric Temple Bell, are a sequence of integers arising in combinatorics that begins thus (sequence A000110 in OEIS): In general, Bn is the number of partitions of a set of size n. ... In mathematics, the factorial of a natural number n is the product of the positive integers less than or equal to n. ... A composite number is a positive integer which has a positive divisor other than one or itself. ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... Look up one in Wiktionary, the free dictionary. ... Look up three in Wiktionary, the free dictionary. ... Look up five in Wiktionary, the free dictionary. ... A prime quadruplet is a group of four primes, consisting of two pairs of twin primes separated only by three non-primes, specifically, a multiple of 2, a multiple of 15 and another multiple of 2. ... In mathematics, a supersingular prime is a certain kind of prime number. ...

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. In mathematics, a semiprime (also called biprime or 2-almost prime) is a natural number that is the product of two (not necessarily distinct) prime numbers. ... In mathematics, a semiprime (also called biprime or 2-almost prime) is a natural number that is the product of two (not necessarily distinct) prime numbers. ... 14 (fourteen) is the natural number following 13 and preceding 15. ... In mathematics, a semiprime (also called biprime or 2-almost prime) is a natural number that is the product of two (not necessarily distinct) prime numbers. ... In mathematics, a semiprime (also called biprime or 2-almost prime) is a natural number that is the product of two (not necessarily distinct) prime numbers. ... 21 (twenty-one) is the natural number following 20 and preceding 22. ...

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 4th composite number in the 3-aliquot tree. The abundant 12 is also a member of this tree. Look up nine in Wiktionary, the free dictionary. ... The term composite can refer to several different things: A dental composite is an type of tooth filling material made of a plastic matrix containing high-strength quartz filler particles. ... In mathematics, an abundant number or excessive number is a number n for which σ(n) > 2n. ... Look up twelve in Wiktionary, the free dictionary. ...

15 and 16 form a Ruth-Aaron pair under the second definition in which repeated prime factors are counted as often as they occur. A Ruth-Aaron pair consists of two consecutive integers (e. ...

Fifteen is the magic constant of the unique order-3 normal magic square: The magic constant of a magic square, an n-by-n matrix, is defined such that the sum of any row, column or main diagonal yields the same result, denoted M2(n). ... It has been suggested that Date magic square be merged into this article or section. ...

15 is the smallest number that can be factorized using Shor's quantum algorithm. The unique magic square of order 3. ... Shors algorithm is a quantum algorithm for factoring an Integer N in O((log N)3) time and O(log N) space, named after Peter Shor. ...

There are 15 solutions to Znám's problem of length 7. Známs problem is the question of what sets of integers, of a given length, can be put together such that each integer in the set is a proper divisor of the product of the other integers in the set, plus 1. ...

15 is a repdigit in binary (1111). In hexadecimal, as well as all higher bases, fifteen is represented as F. In recreational mathematics, a repdigit is a natural number composed of repeated instances of the same digit, most often in the decimal numeral system. ... The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... In mathematics and computer science, hexadecimal, base-16, or simply hex, is a numeral system with a radix, or base, of 16, usually written using the symbols 0–9 and A–F, or a–f. ...

In science

• The atomic number of phosphorus.

It has been suggested that List of elements by atomic number be merged into this article or section. ... General Name, Symbol, Number phosphorus, P, 15 Chemical series nonmetals Group, Period, Block 15, 3, p Appearance waxy white/ red/ black/ colorless Standard atomic weight 30. ...

Astronomy

• Messier object M15, a magnitude 7.5 globular cluster in the constellation Pegasus.
• The New General Catalogue object NGC 15, a spiral galaxy in the constellation Pegasus.
• The Saros number of the solar eclipse series which began on -2557 July 1 and ended on -1223 September 8. The duration of Saros series 15 was 1334.2 years, and it contained 75 solar eclipses.
• The Saros number of the lunar eclipse series which began on -2219 April 30 and ended on -921 June 19. The duration of Saros series 15 was 1298.1 years, and it contained 73 lunar eclipses.

The Messier objects are a set of astronomical objects catalogued by Charles Messier in his catalogue of Nebulae and Star Clusters first published in 1774. ... The central square arcminute of M15 imaged using the lucky imaging technique Globular Cluster M15 (also known as Messier Object 15 or NGC 7078) is a globular cluster in the constellation Pegasus. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... The Globular Cluster M80 in the constellation Scorpius is located about 28,000 light years from the Sun and contains hundreds of thousands of stars. ... Pegasus (IPA: ) is a northern constellation, named after the mythological winged horse Pegasus. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... It has been suggested that spiral nebula be merged into this article or section. ... This article does not cite any references or sources. ... Pegasus (IPA: ) is a northern constellation, named after the mythological winged horse Pegasus. ... A Saros cycle is a period of 6585 + 1/3 days (approximately 18 years 10 days and 8 hours) which can be used to predict eclipses of the sun and the moon. ... Photo taken during the 1999 eclipse. ... is the 182nd day of the year (183rd in leap years) in the Gregorian calendar. ... is the 251st day of the year (252nd in leap years) in the Gregorian calendar. ... Time lapse movie of the 3 March 2007 lunar eclipse A lunar eclipse occurs whenever the Moon passes through some portion of the Earths shadow. ... is the 120th day of the year (121st in leap years) in the Gregorian calendar. ... is the 170th day of the year (171st in leap years) in the Gregorian calendar. ...

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

The Temple in Jerusalem or Holy Temple (Hebrew: בית המקדש, transliterated Bet HaMikdash and meaning literally The Holy House) was located on the Temple Mount (Har HaBayit) in the old city of Jerusalem. ... In the Jewish tradition, a Levite (לֵוִי Attached, Standard Hebrew , Tiberian Hebrew ) is a member of the Hebrew tribe of Levi. ... Korban (קרבן) (plural: Korbanot קרבנות) is a Jewish practice of sacrificing an animal or of making an offering at the Temple. ... Psalms (from the Greek: Psalmoi) (originally meaning songs sung to a harp, from psallein play on a stringed instrument, Ψαλμοί; Hebrew: Tehilim, תהילים) is a book of the Hebrew Bible, Tanakh or Old Testament. ... The system of Hebrew numerals is a quasi-decimal alphabetic numeral system using the letters of the Hebrew alphabet. ... Yodh (also spelled Yud or Yod) is the tenth letter of many Semitic alphabets, including Phoenician, Aramaic, Hebrew , Syriac and Arabic (in abjadi order, 28th in modern order). ... He is the fifth letter of many Semitic alphabets, including Phoenician , Aramaic, Hebrew , Syriac and Arabic . Its sound value is a voiceless glottal fricative (). The Phoenician letter gave rise to the Greek Epsilon, Etruscan , Latin E and Cyrillic Ye. ... At the bottom of the hands, the two letters on each hand combine to form יהוה (YHVH), the name of God. ... (also Teth, Tet) is the ninth letter of many Semitic abjads, including Phoenician, Aramaic, Hebrew , Syriac and Arabic (in abjadi order, 16th in modern order). ...   Vav or waw is the sixth letter of many Semitic alphabets, including Phoenician, Hebrew, Aramaic, and Arabic in abjadi order; it is the twenty-seventh in modern Arabic order. ... Pasch redirects here. ... The Hebrew calendar (Hebrew: ‎) or Jewish calendar is the annual calendar used in Judaism. ... Nisan (Hebrew: נִיסָן, Standard Nisan Tiberian Nîsān ; from Akkadian , from Sumerian nisag First fruits) is the first month of the civil year and the seventh month (eighth, in leap year) of the ecclesiastical year on the Hebrew calendar. ... Sukkot (Hebrew: סוכות or סֻכּוֹת,  ; booths. ... The Hebrew calendar (Hebrew: ‎) or Jewish calendar is the annual calendar used in Judaism. ... Tishrei or Tishri (תִּשְׁרִי, תִּשְׁרֵי, Standard Hebrew Tišri, Tišre, Tiberian Hebrew Tišrî, Tišrê: from Akkadian tašrītu Beginning, from šurrû To begin... Tu Bishvat (or Tu BiShevat) (טו בשבט) is a minor Jewish holiday (meaning there are no restrictions on working) and one of the four Rosh Hashanahs (New Years) mentioned in the Mishnah, the basis of the Talmud. ... A Jewish holiday or Jewish Festival is a day or series of days observed by Jews as holy or secular commemorations of important events in Jewish history. ... The Hebrew calendar (Hebrew: ‎) or Jewish calendar is the annual calendar used in Judaism. ... In the story of Xenogears, Shevat is the name of a country, named after the Hebrew month. ... Shushan Purim is a Jewish holiday which is celebrated on the 15th day of Adar which is the day after Purim by those in Jerusalem and Shushan. ... Purim (Hebrew: פורים Pûrîm lots, from Akkadian pÅ«ru) is a Jewish holiday that commemorates the deliverance from Hamans plot to annihilate all the Jews of the Persian Empire, who had survived the Babylonian captivity, after Persia had conquered Babylonia who in turn had destroyed the First Temple... For other uses, see Jerusalem (disambiguation). ... The Hebrew calendar (Hebrew: ‎) or Jewish calendar is the annual calendar used in Judaism. ... Adar (אֲדָר, Standard Hebrew Adar, Tiberian Hebrew ʾĂḏār: from Akkadian adaru) is the sixth month of the religious year and the twelfth month of the civil year on the Hebrew calendar. ... Tu BAv (Hebrew: טו באב, the fifteenth of the month Av) is a celebratory day in the Jewish calendar. ... A Jewish holiday or Jewish Festival is a day or series of days observed by Jews as holy or secular commemorations of important events in Jewish history. ... The Hebrew calendar (Hebrew: ‎) or Jewish calendar is the annual calendar used in Judaism. ... Av (אָב, Standard Hebrew Av, Tiberian Hebrew ʾĀḇ; from Akkadian abu) is also the eleventh month of the ecclesiastical year and the fifth month of the civil year on the Hebrew calendar. ...

In Sports

• In tennis, the number 15 represents the first point gained in a game.
• In Rugby Union the full back wears the number 15, it is also the number of players on the field.
• Baseball player Frank Duffy, shortstop, wore uniform number 15 for the Cincinnati Reds (1970-71) and Cleveland Indians (1972-77).
• Basketball player Carmelo Anthony wears number 15 for the Denver Nuggets and for Team USA Basketball.
• Baseball catcher Thurman Munson, who died in a crash landing back in 1979.
• Basketball player Vince Carter wears number 15 for the New Jersey Nets.

A rugby union scrum. ... Carmelo Kiyan Anthony (born May 29, 1984)) is an American professional basketball player at the small forward position for the Denver Nuggets of the National Basketball Association and the USA National Team. ... For the original defunct Denver Nuggets, see Denver Nuggets (original). ... Thurman Lee Munson (June 7, 1947 – August 2, 1979) was an American catcher in Major League Baseball who played with the New York Yankees from 1969 to 1979. ... Also: 1979 by Smashing Pumpkins. ... Vincent Lamar Vince Carter (born January 26, 1977) is an American All-Star basketball player in the NBA. He currently is a player and co-captain for the New Jersey Nets. ... ‹ The template below (Taginfo) is being considered for deletion. ...

The age 15

Age 15 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 certain jurisdictions, including some where the age for a driver's license is sixteen.
• In the UK a minor can be sent to prison to await trial at the age of 15

The Quinceañera or Quince Años (sometimes represented XV Años, meaning fifteen years) is, in some Spanish-speaking regions of the Americas, a young womans celebration of her fifteenth birthday, which is celebrated in a unique and different way from her other birthdays. ... 16 (sixteen) is the natural number following 15 and preceding 17. ... Look up minor in Wiktionary, the free dictionary. ...

In other fields

Fifteen total individuals in the mollusk species Donax variabilis comprise the entire coloration and patterning in their phenotypes.

Fifteen is: Image File history File linksMetadata Download high-resolution version (3000x3000, 1582 KB) Coquina shells. ... Image File history File linksMetadata Download high-resolution version (3000x3000, 1582 KB) Coquina shells. ... Classes Caudofoveata Aplacophora Polyplacophora Monoplacophora Bivalvia Scaphopoda Gastropoda Cephalopoda † Rostroconchia The mollusks or molluscs are the large and diverse phylum Mollusca, which includes a variety of familiar creatures well-known for their decorative shells or as seafood. ... Species A genus of mollusc that has a species found on the beaches along the East Coast of Australia (Donax deltoides), but also found in other countries. ... Individuals in the mollusk species Donax variabilis show diverse coloration and patterning in their phenotypes. ...

• The emblem number of Fede and Sol. TE QUIEROO
• 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 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
• 15 minutes of fame
• 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 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 one quarter of an hour; 15 minutes past or before an hour is often known as quarter past and quarter to, respectively.

The Chinese calendar is a lunisolar calendar, akin to the Hebrew calendar & Hindu Calendar, incorporating elements of a lunar calendar with those of a solar calendar. ... This article or section does not cite any references or sources. ... Wikimedia Commons has media related to: Interstate 15 “I-15” redirects here. ... Interstate 80 (Eastshore Freeway) in Berkeley, California: a typical American freeway (MUTCD definition) A freeway, also known as a highway, superhighway, autoroute, autobahn, autostrada, dual carriageway, expressway, Autosnelweg or motorway, depending on the country of discussion, is a type of road designed for safer high-speed operation of motor vehicles... Official language(s) English Capital Sacramento Largest city Los Angeles Largest metro area Greater Los Angeles Area  Ranked 3rd  - Total 158,302 sq mi (410,000 km²)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4. ... Official language(s) English Capital Helena Largest city Billings Area  Ranked 4th  - Total 147,165 sq mi (381,156 km²)  - Width 255 miles (410 km)  - Length 630 miles (1,015 km)  - % water 1  - Latitude 44°26N to 49°N  - Longitude 104°2W to 116°2W Population  Ranked... A rugby union scrum. ... A rugby union scrum. ... The Jacobite Risings were a series of uprisings, rebellions, and wars in the British Isles occurring between 1688 and 1746. ... starting position on a 10×10 draughts board Draughts, also known as checkers, is a group of mental sport board games between two players which involve diagonal moves of uniform pieces and mandatory captures by jumping over the enemys pieces. ... Backgammon is a board game for two players in which pieces are moved according to the roll of dice. ... A solved 15-puzzle The n-puzzle is known in various versions, including the 8 puzzle, the 15 puzzle, and with various names. ... Fifteen (Canadian title, Hillside) was a live-action television series that aired on the Nickelodeon TV channel in the US and on YTV in Canada. ... Fifteen is a restaurant in London, owned and run by the celebrity chef Jamie Oliver. ... This article is about the capital of England and the United Kingdom. ... James Trevor Oliver MBE (May 27, 1975), better known as Jamie Oliver and nicknamed The Naked Chef, is an English celebrity chef. ... 15 minutes of fame (or famous for 15 minutes) is an expression coined by the American artist Andy Warhol. ... For other uses, see Eight ball (disambiguation). ... This article is about the various cue sports. ... This article or section seems not to be written in the formal tone expected of an encyclopedia entry. ... Jeff Ott is an activist, musician, author, and longtime member of the Berkeley punk community, having fronted such seminal bands as Crimpshrine, Basic Radio, and Fifteen. ... Dermatoglyphics (from ancient Greek derma = skin, glyph = carving) is the scientific study of fingerprints. ... The television show Lost includes a number of mysterious elements that have been ascribed to science fiction or supernatural phenomena. ... Lost is an Emmy Award and Golden Globe-winning American serial drama television series that follows the lives of plane crash survivors on a mysterious tropical island, after a passenger jet flying between Australia and the United States crashes somewhere in the South Pacific. ... This article discusses the number Four. ... Look up eight in Wiktionary, the free dictionary. ... 16 (sixteen) is the natural number following 15 and preceding 17. ... 23 (twenty-three) is the natural number following 22 and preceding 24. ... Look up forty-two in Wiktionary, the free dictionary. ... Dmitri Shostakovich   (Russian: , Dmitrij Dmitrievič Å ostakovič) (September 25 [O.S. September 12] 1906–August 9, 1975) was a Russian composer of the Soviet period. ... British Board of Film Classification logo The British Board of Film Classification (BBFC), originally British Board of Film Censors, is the organisation responsible for film and some video game classification and censorship within the United Kingdom. ... Visconti-Sforza tarot deck – The Devil card is a 20th Century remake of the card missing from the original 15th Century Deck The tarot is a set of cards featuring 21 trump cards, the fool, and an extra face card per suit, in addition to the usual suit (face and... A Brazilian ambulance with a SAMU marking SAMU (Service dAide Médicale dUrgence, Emergency Medical Assistance Service) is the French hospital based emergency medical service. ...

Historical years

15 A.D., 15 B.C., 1915, 2015, etc. For other uses, see 15 (disambiguation). ... Vienna becomes a frontier city guarding the Roman Empire against the German tribes to the north. ... Year 1915 (MCMXV) was a common year starting on Friday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Thursday[1] of the 13-day-slower Julian calendar). ... 2015 (MMXV) will be a common year starting on Thursday of the Gregorian calendar. ...

References

• Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 91 - 93