73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest integer with twelve letters in its spelled out name. In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 72 is the natural number following 71 and preceding 73. ... 74 (seventy-four) is the natural number following 73 and preceding 75. ...

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. ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ... In mathematics, a prime number (or a prime) is a positive integer that has exactly two (distinct) natural number divisors, which are 1 and the prime number 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. ... 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. ... 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 mathematics

Seventy-three is the 21st prime number. The previous is seventy-one, with which it comprises the 8th twin prime. It is also a permutable prime with thirty-seven. 73 is a star number. In mathematics, a prime number (or a prime) is a positive integer that has exactly two (distinct) natural number divisors, which are 1 and the prime number itself. ... 71 is the natural number following 70 and preceding 72. ... A twin prime is a prime number that differs from another prime number by two. ... A permutable prime (sometimes called a primutation) is a prime number, which, in a given base, can have its digits switched to any possible permutation and still spell a prime number. ... 37 is the natural number following 36 and preceding 38. ... A star number, or centered 12-gonal number, is a centered figurate number that represents a centered hexagram, such as the one that Chinese checkers are played on. ...

Every positive integer is the sum of at most 73 sixth powers (see Waring's problem). In number theory, Warings problem, proposed in 1770 by Edward Waring, asks whether for every natural number k there exists an associated positive integer s such that every natural number is the sum of at most s kth powers of natural numbers. ...

In base 5, the smallest prime with a composite sum of digits is 73.

73 is a repdigit in base 8 (111). 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 octal numeral system is the base_8 number system, and uses the digits 0–7. ...

In science

• The atomic number of tantalium

In astronomy, It has been suggested that List of elements by atomic number be merged into this article or section. ... General Name, Symbol, Number Tantalum, Ta, 73 Chemical series Transition metals Group, Period, Block 5 (VB), 6 , d Density, Hardness 16650 kg/m3, 6. ... A giant Hubble mosaic of the Crab Nebula, a supernova remnant Astronomy is the science of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earths atmosphere (such as auroras and cosmic background radiation). ...

Messier object M73, a magnitude 9.0 apparent open cluster in the constellation Aquarius

The New General Catalogue object NGC 73, a barred spiral galaxy in the constellation Cetus

The Saros number of the solar eclipse series which began on 717 BC July 16 and ended on 582 September 3. The duration of Saros series 73 was 1298.1 years, and it contained 73 solar eclipses.

The number of seconds it took for the OV-099 shuttle to explode after launch.

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. ... M73 (also known as NGC 6994) is a group of four stars very close to each other in the constellation of Aquarius. ... 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 Pleiades is one of the most famous open clusters. ... This article or section does not adequately cite its references or sources. ... Aquarius (IPA: , Latin: ) is the eleventh sign of the zodiac, situated between Capricornus and Pisces. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... NGC 1300, viewed nearly face-on. ... Cetus (a name from Greek mythology, referring to a Whale or Sea monster, see Ceto) is a constellation of the southern sky, in the region known as the Water, near other watery constellations like Aquarius, Pisces, and Eridanus. ... 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. ... Centuries: 9th century BC - 8th century BC - 7th century BC Decades: 760s BC 750s BC 740s BC 730s BC 720s BC - 710s BC - 700s BC 690s BC 680s BC 670s BC 660s BC Events and Trends Judah, Tyre and Sidon revolt against Assyria 719 BC - Zhou Huan Wang of the... July 16 is the 197th day (198th in leap years) of the year in the Gregorian calendar, with 168 days remaining. ... Events Maurice I succeeds Tiberius II Constantine as Byzantine Emperor. ... September 3 is the 246th day of the year (247th in leap years) in the Gregorian calendar. ... For Solar Eclipse, the alien friend of the rubber doll Betty Spaghetty, see Betty Spaghetty Photo taken by John Walker during the Zambia 2001 eclipse A solar eclipse occurs when the Sun, Moon and Earth are on a single line with the Moon in the middle. ... Look up second in Wiktionary, the free dictionary. ... Shuttle Orbiter Challenger (NASA Orbiter Vehicle Designation: OV-99) was a Space Shuttle orbiter. ... STS-51-L was the 25th launch of a Space Shuttle and the tenth launch of the Challenger. ...

In other fields

Seventy-three is also:

• The total number of books in the Holy Bible in the Catholic version if the Book of Lamentations is counted as a book separate from the Book of Jeremiah.
• The designation of USA Interstate 73, a freeway in North Carolina.
• The registry of the U.S. Navy's nuclear aircraft carrier USS George Washington (CVN-73), named after U.S. President George Washington.
• The year AD 73, 73 BC, or 1973.
• Amateur radio operators often use the number 73 as a way of saying "best regards" (typically when ending a QSO). [1] This is the reason for the name of the magazine 73 (also known as 73 Amateur Radio Today, an amateur radio magazine published by Wayne Green (who also started Byte magazine) from 1960 to 2003.
• Each of the five seasons of the Discordian calendar has 73 days.
• The name of a 1980's children's television programme in the United Kingdom. It ran from 1982-1988 and starred Sandi Toksvig
• The Blues Image song "Ride Captain Ride" (1970) begins with "73 men sailed out on theSan Francisco Bay"
• Singer Johnny Mathis has had 73 charted albums on Billboard Top 200 Charts
• Pizza 73 is a Canadian pizza chain with 48 stores
• Larry King celebrated 50 years in broadcasting in 2007 at age 73
• Herbert Hoover toured Germany, at the request of President Truman in 1947, at age 73
• W.B. Yeats wrote his last poem "The Black Tower," at age 73
• Ronald Reagan was reelected president in 1984 at age 73
• Game show Match Game '73 in 1973
• The Felony Squad aired on ABC from '66 - '69 for 73 episodes
• The TV show Hope & Faith aired on ABC, 2003 - 2006 for 73 episodes
• Fender Rhodes Stage 73 Piano
• The Space Shuttle Challenger exploded January 28, 1986, 73 seconds after launch
• Sonnet 73 by William Shakespeare
• PT-73, the PT boat on TV's McHale's Navy

The Bible (From Greek βιβλια—biblia, meaning books, which in turn is derived from βυβλος—byblos meaning papyrus, from the ancient Phoenician city of Byblos which exported papyrus) is the sacred scripture of Christianity. ... Interstate 73 (abbreviated I-73) is a main route of the Interstate Highway System, currently located entirely within the U.S. state of North Carolina. ... Official language(s) English Capital Raleigh Largest city Charlotte Area  Ranked 28th  - Total 53,865 sq mi (139,509 km²)  - Width 150 miles (240 km)  - Length 560[1] miles (901 km)  - % water 9. ... USS George Washington (CVN 73) (Callsign: WARFIGHTER) is the sixth ship in the Nimitz class of nuclear-powered supercarriers, and the fourth United States Navy ship to be named after George Washington, first President of the United States. ... George Washington (February 22, 1732 – December 14, 1799)[1] led Americas Continental Army to victory over Britain in the American Revolutionary War (1775–1783), and was later elected the first president of the United States under the U.S. Constitution. ... This article is about the year 73. ... Centuries: 2nd century BC - 1st century BC - 1st century Decades: 120s BC 110s BC 100s BC 90s BC 80s BC - 70s BC - 60s BC 50s BC 40s BC 30s BC 20s BC Years: 78 BC 77 BC 76 BC 75 BC 74 BC - 73 BC - 72 BC 71 BC 70... 1973 (MCMLXXIII) was a common year starting on Monday. ... An amateur radio operator An amateur radio operator is an individual who has been assigned an amateur radio license by a governmental regulatory authority. ... The Q code is a standardized collection of three-letter message encodings, all starting with the letter Q, initially developed for commercial radiotelegraph communication, and later adopted by other radio services, especially amateur radio. ... 73 Magazine (also known as 73 Amateur Radio Today) (OCLC 22239204) was a U.S.-based amateur radio magazine that was published from 1960 to 2003. ... Ham radio station with modern solid-state transceiver featuring LCD display and DSP capabilities Ham radio station with vintage vacuum tube gear featuring separate transmitter, receiver and power supply Amateur radio, often called Ham radio, is a hobby and public service enjoyed by about 6 million people throughout the world. ... December 1975 issue of Byte (Vol 1. ... 1960 (MCMLX) was a leap year starting on Friday (the link is to a full 1960 calendar). ... 2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ... The Discordian calendar is an alternative calendar used by some adherents of Discordianism. ... Sandi Toksvig, official photograph Sandi Toksvig (IPA: ) (born 3 May 1958 in Copenhagen) is a Danish comedian, author, and radio presenter based in the United Kingdom. ... Cover of album Open Blues Image was a critically acclaimed late 1960s rock band. ... 1970 (MCMLXX) was a common year starting on Thursday. ... San Francisco Bay, San Pablo Bay, and the Golden Gate San Francisco Bay is a shallow, productive estuary through which water draining approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean. ... John Royce Mathis (b. ... The Billboard 200 is a listing of the 200 highest selling music albums in the United States, published weekly in Billboard magazine. ... Pizza 73 is a delivery and take-out chain serving pizza and chicken wings. ... Larry King (born Lawrence Harvey Zeiger on November 19, 1933) is an award-winning American broadcaster. ... 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the Anno Domini era. ... A 1907 engraving of Yeats. ... Ronald Wilson Reagan (February 6, 1911 – June 5, 2004) was the 40th President of the United States (1981 – 1989) and the 33rd Governor of California (1967 – 1975). ... 1984 (MCMLXXXIV) was a leap year starting on Sunday of the Gregorian calendar. ... The Match Game was an American television game show, most often hosted by Gene Rayburn. ... Felony Squad was a half-hour television crime drama originally broadcast on the ABC network from September 12, 1966 to January 31, 1969, a span encompassing 73 episodes. ... Hope & Faith was an American sitcom which aired for three seasons on ABC. For its first two seasons the show was part of a revived TGIF comedy block. ... A Rhodes piano is a musical instrument. ... January 28 is the 28th day of the year in the Gregorian calendar. ... 1986 (MCMLXXXVI) was a common year starting on Wednesday of the Gregorian calendar. ... Synopsis Sonnet 73 focuses upon the theme of old age, with each of the three quatrains encompassing a metaphor. ... PT boats in line astern. ... McHales Navy was an American television sitcom series. ...

In sports

• The best-known car number of retired NASCAR driver Phil Barkdoll.
• In baseball, the single-season home run record set by Barry Bonds in 2001.
• In basketball, the number of games the Philadelphia 76ers lost in the 1972-73 season (9-73), the most losses in NBA history.
• University of Texas football player Jonathan Scott wore #73
• MLB: Kenny Rogers wore #73 with the New York Mets
• NFL: San Francisco 49ers Leo Nomellini wore #73
• NFL: New England Patriots John Hannah's retired #73
• NFL: New York Jets Joe Klecko's retired ##73
• NFL: Indianapolis Colts Adam Meadows wore #73
• NFL: Cleveland Browns Alvin Smith wears #73
• NFL: Seattle Seahawks Wayne Hunter wears #73
• NFL: St. Louis Rams Jimmy Kennedy wears #73
• NFL: Dallas Cowboys Larry Allen wears #73
• NHL: Los Angeles Kings John Zeiler wears #73
• NHL: Montreal Canadiens Michael Ryder wears #73
• NFL: Green Bay Packers Daryn Colledge wears #73