79 (number)
Encyclopedia
Seventy-nine is the natural number
following 78
and preceding 80
.
79 may represent:
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 78
78 (number)
78 is the natural number following 77 and followed by 79.-In mathematics:78 is a triangular number, and its factorization makes it a sphenic number...
and preceding 80
80 (number)
80 is the natural number following 79 and preceding 81.- In mathematics :The sum of Euler's totient function φ over the first sixteen integers is 80....
.
79 may represent:
In mathematics
- An oddEven and odd numbersIn mathematics, the parity of an object states whether it is even or odd.This concept begins with integers. An even number is an integer that is "evenly divisible" by 2, i.e., divisible by 2 without remainder; an odd number is an integer that is not evenly divisible by 2...
number - The smallest number that can't be represented as a sum of fewer than 19 fourth powerFourth powerIn arithmetic and algebra, the fourth power of a number n is the result of multiplying n by itself four times. So:Fourth powers are also formed by multiplying a number by its cube...
s - A strictly non-palindromic numberPalindromic numberA palindromic number or numeral palindrome is a 'symmetrical' number like 16461, that remains the same when its digits are reversed. The term palindromic is derived from palindrome, which refers to a word like rotor that remains unchanged under reversal of its letters...
- The 22nd prime numberPrime numberA 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 next is 8383 (number)83 is the natural number following 82 and preceding 84.-In mathematics:Eighty-three is the sum of three consecutive primes as well as the sum of five consecutive primes ....
) - The smallest prime number p for which the real quadratic field Q[√p] has class numberClass numberIn mathematics, class number may refer to* Class number , the number of conjugacy classes of a group*The size of the ideal class group of a number ring*The number of equivalence classes of binary quadratic forms of a given discriminant...
greater than 1 (namely 3) - A cousin primeCousin primeIn mathematics, cousin primes are prime numbers that differ by four; compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six....
with 8383 (number)83 is the natural number following 82 and preceding 84.-In mathematics:Eighty-three is the sum of three consecutive primes as well as the sum of five consecutive primes .... - An emirpEmirpAn emirp is a prime number that results in a different prime when its digits are reversed. This definition excludes the related palindromic primes. Emirps are also called reversible primes....
, because the reverse of 79, 9797 (number)97 is the natural number following 96 and preceding 98.-In mathematics:97 is the 25th prime number , following 89 and preceding 101. 97 is a Proth prime as it is 3 × 25 + 1.The numbers 97, 907, 9007, 90007 and 900007 are happy primes...
, is also a prime - A fortunate prime
- A prime number that is also a Gaussian prime (since it is of the form
) - A happy prime
- A Higgs primeHiggs primeA Higgs prime is a prime number with a totient that evenly divides the square of the product of the smaller Higgs primes...
- A Kynea prime (
) - A lucky prime
- A permutable primePermutable primeA permutable prime is a prime number, which, in a given base, can have its digits' positions switched through any permutation and still spell a prime number. H. E...
, with ninety-seven97 (number)97 is the natural number following 96 and preceding 98.-In mathematics:97 is the 25th prime number , following 89 and preceding 101. 97 is a Proth prime as it is 3 × 25 + 1.The numbers 97, 907, 9007, 90007 and 900007 are happy primes... - A Pillai prime, because 23!FactorialIn mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n...
+ 1 is divisible by 79, but 79 is not one more than a multipleMultiple (mathematics)In mathematics, a multiple is the product of any quantity and an integer. In other words, for the quantities a and b, we say that b is a multiple of a if b = na for some integer n , which is called the multiplier or coefficient. If a is not zero, this is equivalent to saying that b/a is an integer...
of 2323 (number)23 is the natural number following 22 and preceding 24.- In mathematics :Twenty-three is the ninth prime number, the smallest odd prime that is not a twin prime. Twenty-three is also the fifth factorial prime, the third Woodall prime... - A regular prime
- A prime in a residue classesDirichlet's theorem on arithmetic progressionsIn number theory, Dirichlet's theorem, also called the Dirichlet prime number theorem, states that for any two positive coprime integers a and d, there are infinitely many primes of the form a + nd, where n ≥ 0. In other words, there are infinitely many primes which are...
4n+3, 8n+7, and 10n+9 - A right-truncatable prime, because when the last digit (9) is removed, the remaining number (7) is still prime
- A sexy primeSexy primeIn mathematics, a sexy prime is a prime number that differs from another prime number by six. For example, the numbers 5 and 11 are both sexy primes, because they differ by 6...
(with 7373 (number)73 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 :...
) - The n value of the Wagstaff prime 201487636602438195784363
In astronomy
- Messier object 79Messier 79Messier 79 is a globular cluster in the Lepus constellation. It was discovered by Pierre Méchain in 1780...
(M79), a magnitude 8.5 globular 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....
LepusLepus (constellation)Lepus is a constellation lying just south of the celestial equator, immediately south of Orion. Its name is Latin for hare. Although the hare does not represent any particular figure in Greek mythology, Lepus was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and it... - New General Catalogue object 79 (NGC 79), a 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 constellation AndromedaAndromeda (constellation)Andromeda is a constellation in the northern sky. It is named after Andromeda, the princess in the Greek legend of Perseus who was chained to a rock to be eaten by the sea monster Cetus... - Saros seriesSaros cycleThe saros is a period of 223 synodic months , that can be used to predict eclipses of the Sun and Moon. One saros after an eclipse, the Sun, Earth, and Moon return to approximately the same relative geometry, and a nearly identical eclipse will occur, in what is referred to as an eclipse cycle...
79, which began on -434 May 21 and ended on 828 June 16, lasting 1262.1 years, and with 71 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...
s - Saros seriesSaros cycleThe saros is a period of 223 synodic months , that can be used to predict eclipses of the Sun and Moon. One saros after an eclipse, the Sun, Earth, and Moon return to approximately the same relative geometry, and a nearly identical eclipse will occur, in what is referred to as an eclipse cycle...
79, which began on -150 February 16 and ended on 1166 April 12, lasting 1316.2 years, and with 74 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...
s
In other fields
- Live Seventy Nine, an album by HawkwindHawkwindHawkwind are an English rock band, one of the earliest space rock groups. Their lyrics favour urban and science fiction themes. They are also a noted precursor to punk rock and now are considered a link between the hippie and punk cultures....
- The years 79 AD79Year 79 was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Vespasianus...
(or CE), 79 BC79 BCYear 79 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Isauricus and Pulcher...
(E), or 1979 - The designation of Interstate 79Interstate 79Interstate 79 is an Interstate Highway in the eastern United States, designated from Interstate 77 in Charleston, West Virginia to Pennsylvania Route 5 and Pennsylvania Route 290 in Erie, Pennsylvania...
, a freeway that runs from West VirginiaWest VirginiaWest Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...
to PennsylvaniaPennsylvaniaThe Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...
. - The number of Star Trek: The Original SeriesStar Trek: The Original SeriesStar Trek is an American science fiction television series created by Gene Roddenberry, produced by Desilu Productions . Star Trek was telecast on NBC from September 8, 1966, through June 3, 1969...
episodes (not counting the first pilotTelevision pilotA "television pilot" is a standalone episode of a television series that is used to sell the show to a television network. At the time of its inception, the pilot is meant to be the "testing ground" to see if a series will be possibly desired and successful and therefore a test episode of an...
, "The Cage"The Cage (TOS episode)"The Cage" is the first pilot episode of the Star Trek: The Original Series science fiction series. It was completed in early 1965 , but not broadcast on television in its complete form until the autumn of 1988. The episode was written by Gene Roddenberry and directed by Robert Butler...
, which was enclosed into "The Menagerie") - The number of recommendations in the Iraq Study Group ReportIraq Study Group ReportThe Iraq Study Group Report: The Way Forward – A New Approach is the report of the Iraq Study Group, as mandated by the United States Congress. It is an assessment of the state of the war in Iraq as of December 6, 2006, when the ISG released the report to the public on the Internet and as a...
- The record cumulative weeks at #1 on the BillboardBillboard (magazine)Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis...
charts, held by Elvis PresleyElvis PresleyElvis Aaron Presley was one of the most popular American singers of the 20th century. A cultural icon, he is widely known by the single name Elvis. He is often referred to as the "King of Rock and Roll" or simply "the King".... - The age of Asa LongAsa LongAsa Long was an important figure in English draughts generally called checkers in his native USA.- Checkers champion :Asa A. Long was born in Antwerp, Ohio in 1904. As a child he learned the game of checkers when the family moved to Toledo, Ohio. At 16 he won the state tournament and at 18 he...
(1904-99) when she became the oldest United StatesUnited StatesThe United States of America is a federal constitutional republic comprising fifty states and a federal district...
checkersEnglish draughtsEnglish draughts or checkers , also called American checkers or straight checkers or in Israel damka, is a form of draughts board game. Unlike international draughts, it is played on an eight by eight squared board with twelve pieces on each side...
championChampionA champion is the victor in a challenge, contest or competition.There can be a territorial pyramid of championships, e.g. local, regional / provincial, state, national, continental and world championships, and even further divisions at one or more of these levels, as in soccer. Their champions...
(1984) - The cost in pence of one song from the UK iTunes StoreITunes StoreThe iTunes Store is a software-based online digital media store operated by Apple. Opening as the iTunes Music Store on April 28, 2003, with over 200,000 items to purchase, it is, as of April 2008, the number-one music vendor in the United States...
- The number of the French department Deux-SèvresDeux-SèvresDeux-Sèvres is a French département. Deux-Sèvres literally means "two Sèvres": the Sèvre Nantaise and the Sèvre Niortaise are two rivers which have their sources in the department.-History:...