61 (number)
Encyclopedia
- LXI redirects here, for the electronics association, see LAN eXtensions for Instrumentation.
- For the Cyrillic letter, see Ы.
61 (sixty-one) is the natural number
Natural number
In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...
following 60
60 (number)
60 is the natural number following 59 and preceding 61. Being three times twenty, 60 is called "three score" in some older literature.-In mathematics:...
and preceding 62
62 (number)
62 is a natural number following 61 and preceding 63. It is a composite number with the divisors 2 and 31 being the eighteenth discreet semiprime. 62 has an aliquot sum of 34; itself a discrete semiprime, and the 10 member aliquot sequence . 62 is therefore the tenth member of the 7-aliquot tree...
.
In mathematics
It is the 18th prime numberPrime number
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number. For example 5 is prime, as only 1 and 5 divide it, whereas 6 is composite, since it has the divisors 2...
. The previous is 59
59 (number)
59 is the natural number following 58 and preceding 60.-In mathematics:Fifty-nine is the 17th smallest prime number. The next is sixty-one, with which it comprises a twin prime. 59 is an irregular prime, a safe prime and the 14th supersingular prime. It is an Eisenstein prime with no imaginary...
, with which it comprises a twin prime
Twin prime
A twin prime is a prime number that differs from another prime number by two. Except for the pair , this is the smallest possible difference between two primes. Some examples of twin prime pairs are , , , , and...
. Sixty-one is a cuban prime of the form
.Sixty-one might be the largest prime that divides the product of the next two primes plus 1. If there is a larger such prime, it would have to be greater than 179424673.
Sixty-one is the sum of two squares, 52 + 62, and it is also a centered square number
Centered square number
In elementary number theory, a centered square number is a centered figurate number that gives the number of dots in a square with a dot in the center and all other dots surrounding the center dot in successive square layers. That is, each centered square number equals the number of dots within a...
, a centered hexagonal number
Centered hexagonal number
A centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice....
and a centered decagonal number
Centered decagonal number
A centered decagonal number is a centered figurate number that represents a decagon with a dot in the center and all other dots surrounding the center dot in successive decagonal layers...
.
Since 8! + 1 is divisible by 61 but 61 is not one more than a multiple of 8, 61 is a Pillai prime. In the list of Fortunate numbers, 61 occurs thrice, since adding 61 to either the tenth, twelfth or seventeenth primorial
Primorial
In mathematics, and more particularly in number theory, primorial is a function from natural numbers to natural numbers similar to the factorial function, but rather than multiplying successive positive integers, only successive prime numbers are multiplied...
gives a prime number (namely 6469693291, 7420738134871 and 1922760350154212639131).
It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 6, 1, 7, 8, 15, 23, 38, 61...
In science
The chemical element with the atomic numberAtomic number
In chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. It is conventionally represented by the symbol Z. The atomic number uniquely identifies a chemical element...
61 (promethium
Promethium
Promethium is a chemical element with the symbol Pm and atomic number 61. It is notable for being the only exclusively radioactive element besides technetium that is followed by chemical elements with stable isotopes.- Prediction :...
), a lanthanide, is the element with the secondary lowest ordinal number, which does not possess any stable isotopes. The promethium preceding element with atomic number
Atomic number
In chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. It is conventionally represented by the symbol Z. The atomic number uniquely identifies a chemical element...
60 (neodymium
Neodymium
Neodymium is a chemical element with the symbol Nd and atomic number 60. It is a soft silvery metal that tarnishes in air. Neodymium was discovered in 1885 by the Austrian chemist Carl Auer von Welsbach. It is present in significant quantities in the ore minerals monazite and bastnäsite...
) and the promethium following element 62 (samarium
Samarium
Samarium is a chemical element with the symbol Sm, atomic number 62 and atomic weight 150.36. It is a moderately hard silvery metal which readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3...
) have all stable isotope
Stable isotope
Stable isotopes are chemical isotopes that may or may not be radioactive, but if radioactive, have half-lives too long to be measured.Only 90 nuclides from the first 40 elements are energetically stable to any kind of decay save proton decay, in theory...
s.
Astronomy
- Messier objectMessier objectThe Messier objects are a set of astronomical objects first listed by French astronomer Charles Messier in 1771. The original motivation of the catalogue was that Messier was a comet hunter, and was frustrated by objects which resembled but were not comets...
M61Messier 61Messier 61 is a spiral galaxy in the Virgo Cluster. It was discovered by Barnabus Oriani on May 5, 1779.M61 is one of the larger members of the Virgo Cluster.Six supernovae have been observed in this galaxy:...
, a magnitude 10.5 galaxyGalaxyA galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component tentatively dubbed dark matter. The word galaxy is derived from the Greek galaxias , literally "milky", a...
in the constellationConstellationIn modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
VirgoVirgo (constellation)Virgo is one of the constellations of the zodiac. Its name is Latin for virgin, and its symbol is . Lying between Leo to the west and Libra to the east, it is the second largest constellation in the sky... - The New General CatalogueNew General CatalogueThe New General Catalogue of Nebulae and Clusters of Stars is a well-known catalogue of deep sky objects in astronomy. It contains 7,840 objects, known as the NGC objects...
object NGC 61, a double spiral galaxySpiral galaxyA spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble sequence. Spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as...
in the constellation PiscesPisces (constellation)Pisces is a constellation of the zodiac. Its name is the Latin plural for fish, and its symbol is . It lies between Aquarius to the west and Aries to the east... - The Saros number of the solar eclipseSolar eclipseAs seen from the Earth, a solar eclipse occurs when the Moon passes between the Sun and the Earth, and the Moon fully or partially blocks the Sun as viewed from a location on Earth. This can happen only during a new moon, when the Sun and the Moon are in conjunction as seen from Earth. At least...
series which began on -973 May 10 and ended on 289 June 5. The duration of Saros series 61 was 1262.1 years, and it contained 71 solar eclipses. - The Saros number of the lunar eclipseLunar eclipseA lunar eclipse occurs when the Moon passes behind the Earth so that the Earth blocks the Sun's rays from striking the Moon. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a...
series which began on -870 October 20 and ended on 609 March 26. The duration of Saros series 61 was 1478.4 years, and it contained 83 lunar eclipses. - 61 Ursae Majoris is located about 31.1 light-years from Sol.http://www.solstation.com/stars/61uma.htm
- 61 Cygni was christened the "Flying Star" in 1792 by Giuseppe Piazzi (1746-1826) for its unusually large proper motion. http://www.solstation.com/stars/61cygni2.htm
In other fields
Sixty-one is:- The number of the French department OrneOrneOrne is a department in the northwest of France, named after the river Orne.- History :Orne is one of the original 83 departments created during the French Revolution, on March 4, 1790. It was created from parts of the former provinces of Normandy and Perche.- Geography :Orne is in the region of...
- The code for international direct dial phonePhoneWithin phonetics, a phone is:* a speech sound or gesture considered a physical event without regard to its place in the phonology of a language* a speech segment that possesses distinct physical or perceptual properties...
calls to AustraliaAustraliaAustralia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area... - 61*, a 2001 baseball movie directed by Billy CrystalBilly CrystalWilliam Edward "Billy" Crystal is an American actor, writer, producer, comedian and film director. He gained prominence in the 1970s for playing Jodie Dallas on the ABC sitcom Soap and became a Hollywood film star during the late 1980s and 1990s, appearing in the critical and box office successes...
- The Highway 61 Blues Festival occurs in June in Leland, MississippiMississippiMississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...
- Part 61 is a law created by the FAA regarding medical exams. This law has often come under attack by AOPA.
- Highway 61 RevisitedHighway 61 RevisitedHighway 61 Revisited is the sixth studio album by singer-songwriter Bob Dylan. It was released in August 1965 by Columbia Records. On his previous album, Bringing It All Back Home, Dylan devoted Side One of the album to songs accompanied by an electric rock band, and Side Two to solo acoustic numbers...
is a Bob DylanBob DylanBob Dylan is an American singer-songwriter, musician, poet, film director and painter. He has been a major and profoundly influential figure in popular music and culture for five decades. Much of his most celebrated work dates from the 1960s when he was an informal chronicler and a seemingly...
album - The P-61P-61 Black WidowThe Northrop P-61 Black Widow was the first operational U.S. military aircraft designed specifically for night interception of aircraft, and was the first aircraft specifically designed to use radar. It was an all-metal, twin-engine, twin-boom design developed during World War II...
is the Northrop designed fighter first designated as the XP-61. It first flew on May 26, 1942. It is also known as the Black Widow as it was the first fighter aircraft designed to be a night fighter - Sixty 1 brand tobacco produced by Nationwide Tobacco
- 61A is the LondonLondonLondon is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...
address of Margot Wendice (Grace KellyGrace KellyGrace Patricia Kelly was an American actress who, in April 1956, married Rainier III, Prince of Monaco, to become Princess consort of Monaco, styled as Her Serene Highness The Princess of Monaco, and commonly referred to as Princess Grace.After embarking on an acting career in 1950, at the age of...
) and Tony Wendice (Ray MillandRay MillandRay Milland was a Welsh actor and director. His screen career ran from 1929 to 1985, and he is best remembered for his Academy Award–winning portrayal of an alcoholic writer in The Lost Weekend , a sophisticated leading man opposite a corrupt John Wayne in Reap the Wild Wind , the murder-plotting...
) in the movie "Dial M for MurderDial M for MurderDial M for Murder is a 1954 American thriller film adapted from a successful stage play by Frederick Knott, directed by Alfred Hitchcock and starring Ray Milland, Grace Kelly, and Robert Cummings. The movie was released by the Warner Bros...
" - 1 Liberty Place is Philadelphia's tallest building at 61 stories
- The number of points required to win a "standard" game of CribbageCribbageCribbage, or crib, is a card game traditionally for two players, but commonly played with three, four or more, that involves playing and grouping cards in combinations which gain points...
In sports
- New York YankeesNew York YankeesThe New York Yankees are a professional baseball team based in the The Bronx, New York. They compete in Major League Baseball in the American League's East Division...
Roger MarisRoger MarisRoger Eugene Maris was an American Major League Baseball right fielder. During the 1961 season, he hit a record 61 home runs for the New York Yankees, breaking Babe Ruth's single-season record of 60 home runs...
hit 61 home runs in 1961 - Nolan RyanNolan RyanLynn Nolan Ryan, Jr. , nicknamed "The Ryan Express", is a former Major League Baseball pitcher. He is currently principal owner, president and CEO of the Texas Rangers....
and Tom SeaverTom SeaverGeorge Thomas "Tom" Seaver , nicknamed "Tom Terrific" and "The Franchise", is a former Major League Baseball pitcher. He pitched from 1967-1986 for four different teams in his career, but is noted primarily for his time with the New York Mets...
each had 61 career shutouts - Hockey great Wayne GretzkyWayne GretzkyWayne Douglas Gretzky, CC is a Canadian former professional ice hockey player and former head coach. Nicknamed "The Great One", he is generally regarded as the best player in the history of the National Hockey League , and has been called "the greatest hockey player ever" by many sportswriters,...
holds or shares 61 NHL records (40 for regular season, 15 for Stanley Cup playoff and 6 for All-Star Games) - Los Angeles LakersLos Angeles LakersThe Los Angeles Lakers are an American professional basketball team based in Los Angeles, California. They play in the Pacific Division of the Western Conference in the National Basketball Association...
' Elgin BaylorElgin BaylorElgin Gay Baylor is a retired Hall of Fame American basketball player and former NBA general manager who played 13 seasons as a forward for the NBA's Minneapolis Lakers/Los Angeles Lakers....
set a record for 61 points in a NBA finals game against the Boston Celtics (April 14, 1962) - Rotation, a variation of pool, is sometimes called 61
- Richie EvansRichie EvansRichard Ernest Evans , was an American racing driver who won nine NASCAR National Modified Championships, including eight in a row from 1978 to 1985. The International Motorsports Hall of Fame lists this achievement as "one of the supreme accomplishments in motorsports"...
' NASCAR Whelen Modified Tour car number was 61 until his death in 1985