1987 (number)
Encyclopedia
| Cardinal Cardinal number In mathematics, cardinal numbers, or cardinals for short, are a generalization of the natural numbers used to measure the cardinality of sets. The cardinality of a finite set is a natural number – the number of elements in the set. The transfinite cardinal numbers describe the sizes of infinite... |
one thousand nine hundred [and] eighty-seven |
| Ordinal Ordinal number In set theory, an ordinal number, or just ordinal, is the order type of a well-ordered set. They are usually identified with hereditarily transitive sets. Ordinals are an extension of the natural numbers different from integers and from cardinals... |
1987th (one thousand nine hundred [and] eighty seventh) |
| Factorization Factorization In mathematics, factorization or factoring is the decomposition of an object into a product of other objects, or factors, which when multiplied together give the original... |
Prime Prime 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... |
| Divisor Divisor In mathematics, a divisor of an integer n, also called a factor of n, is an integer which divides n without leaving a remainder.-Explanation:... s |
1 |
| Roman numeral | MCMLXXXVII |
| Binary Binary numeral system The binary numeral system, or base-2 number system, represents numeric values using two symbols, 0 and 1. More specifically, the usual base-2 system is a positional notation with a radix of 2... |
11111000011 |
| Hexadecimal Hexadecimal In mathematics and computer science, hexadecimal is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F to represent values ten to fifteen... |
7C3 |
1987 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 1986 and preceding 1988.
In mathematics
1987 is an odd number and the 300th 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...
. It starts the sexy prime triplet (1987, 1993, 1999). Being of the form 4n + 3, it is a Gaussian prime
Gaussian integer
In number theory, a Gaussian integer is a complex number whose real and imaginary part are both integers. The Gaussian integers, with ordinary addition and multiplication of complex numbers, form an integral domain, usually written as Z[i]. The Gaussian integers are a special case of the quadratic...
. It is a lucky number
Lucky number
In number theory, a lucky number is a natural number in a set which is generated by a "sieve" similar to the Sieve of Eratosthenes that generates the primes.Begin with a list of integers starting with 1:...
and therefore also a lucky prime. 1987 is a prime factor
Prime factor
In number theory, the prime factors of a positive integer are the prime numbers that divide that integer exactly, without leaving a remainder. The process of finding these numbers is called integer factorization, or prime factorization. A prime factor can be visualized by understanding Euclid's...
of the 9th number in Sylvester's sequence
Sylvester's sequence
In number theory, Sylvester's sequence is an integer sequence in which each member of the sequence is the product of the previous members, plus one. The first few terms of the sequence are:...
, and is the 15th prime to divide any number in the sequence.
There are 1987 polyiamond
Polyiamond
A polyiamond is a polyform whose base form is an equilateral triangle. The word polyiamond is a back-formation from diamond, because this word is often used to describe the shape of a pair of equilateral triangles placed base to base, and the initial "di-" looked like a Greek prefix meaning...
s with 12 cells that tile the plane isohedrally.
In astronomy
- SN 1987ASN 1987ASN 1987A was a supernova in the outskirts of the Tarantula Nebula in the Large Magellanic Cloud, a nearby dwarf galaxy. It occurred approximately 51.4 kiloparsecs from Earth, approximately 168,000 light-years, close enough that it was visible to the naked eye. It could be seen from the Southern...
was a supernovaSupernovaA supernova is a stellar explosion that is more energetic than a nova. It is pronounced with the plural supernovae or supernovas. Supernovae are extremely luminous and cause a burst of radiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months...
first seen on February 23, 1987. It was the closest observed supernova since 1604. - 1987 Kaplan1987 Kaplan1987 Kaplan is a main-belt asteroid discovered on September 11, 1952 by P. F. Shajn at Simeis.- External links :*...
is a main-beltAsteroid beltThe asteroid belt is the region of the Solar System located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets...
asteroidAsteroidAsteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones...
discovered in 1952. - NGCNew 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...
1987 is a globular star clusterGlobular clusterA globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. The name of this category of star cluster is...
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....
MensaMensa (constellation)Mensa is a constellation in the southern sky, created in the 18th century. Its name is Latin for table. It covers a keystone-shaped wedge of sky stretching from approximately 4h to 7.5h of right ascension, and −71 to −85.5 degrees of declination. Other than the south polar constellation...
.
In entertainment
- 1987 is the title of the European version of the album WhitesnakeWhitesnake (album)Tracks 12-15 taken from Live: In the Shadow of the Blues-20th Anniversary Edition DVD:-Singles:*"Here I Go Again" *"Is This Love"*"Still of the Night"*"Crying in the Rain" *"Give Me All Your Love"-Personnel:...
by the BritishBritish peopleThe British are citizens of the United Kingdom, of the Isle of Man, any of the Channel Islands, or of any of the British overseas territories, and their descendants...
rockRock musicRock music is a genre of popular music that developed during and after the 1960s, particularly in the United Kingdom and the United States. It has its roots in 1940s and 1950s rock and roll, itself heavily influenced by rhythm and blues and country music...
band WhitesnakeWhitesnakeWhitesnake are an English rock band, founded in 1978 by David Coverdale after his departure from his previous band, Deep Purple. The band's early material has been compared by critics to Deep Purple, but by the mid 1980s they had moved to a more commercial hard rock style...
. - 1987 (What the Fuck Is Going On?)1987 (What the Fuck Is Going On?)1987 is the debut album of The Justified Ancients of Mu Mu . 1987 was produced using extensive unauthorised samples which plagiarised a wide range of musical works, continuing a theme begun in The JAMs' debut single "All You Need Is Love"...
is the debut album of the British band The Justified Ancients of Mu MuThe KLFThe KLF were one of the seminal bands of the British acid house movement during the late 1980s and early 1990s....
(The JAMs: Bill DrummondBill DrummondWilliam Ernest Drummond is a Scottish artist, musician, writer and record producer. He was the co-founder of late 1980s avant-garde pop group The KLF and its 1990s media-manipulating successor, the K Foundation, with which he burned a million pounds in 1994...
and Jimmy CautyJimmy CautyJames Francis Cauty is a British artist and musician born in Liverpool, England, in 1956...
). - "1987" is the sixth episode of the second season of the television comedy series Robot ChickenRobot ChickenRobot Chicken is an American stop motion animated television series created and executive produced by Seth Green and Matthew Senreich along with co-head writers Douglas Goldstein and Tom Root. Green provides many voices for the show...
.
In other fields
- UN 1987 is the UN numberUN numberUN numbers or UN IDs are four-digit numbers that identify hazardous substances, and articles in the framework of international transport....
for the hazardous substance "AlcoholAlcoholIn chemistry, an alcohol is an organic compound in which the hydroxy functional group is bound to a carbon atom. In particular, this carbon center should be saturated, having single bonds to three other atoms....
s, n.o.s." (n.o.s. stands for not otherwise specified). - There are 1987 ways to place 4 nonattacking chess kingsKing (chess)In chess, the king is the most important piece. The object of the game is to trap the opponent's king so that its escape is not possible . If a player's king is threatened with capture, it is said to be in check, and the player must remove the threat of capture on the next move. If this cannot be...
on a 5 × 5 board. - 1987 is the most recent year to have no repeating digits, the next being 2013