70 (number)
Encyclopedia
70 is the natural number
following 69
and preceding 71
.
makes it a sphenic number
. 70 is a Pell number
and a generalized heptagonal number, one of only two numbers to be both. Also, it is the seventh pentagonal number
and the fourth 13
-gonal number, as well as the fifth pentatope number
. It is the smallest weird number
.
Since it is possible to find sequences of 70 consecutive integers such that each inner member shares a factor with either the first or the last member, 70 is an Erdős–Woods number
.
In base 10, it is a Harshad number
.
do not have a word for 70, instead using "soixante-dix" (60 + 10). Other French
-speaking countries such as Belgium
, Switzerland
, Aosta Valley and Jersey
do have a word for it, using "septante."
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 69
69 (number)
69 is a number following 68 and preceding 70.- In mathematics:The aliquot sum of sixty-nine is 27 within the aliquot sequence 69 being the third composite number in the 13-aliquot tree.69 is a semiprime...
and preceding 71
71 (number)
71 is the natural number following 70 and preceding 72.-In mathematics:71 is the algebraic degree of Conway's constant, a remarkable number arising in the study of look-and-say sequences....
.
In mathematics
Its factorizationFactorization
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...
makes it a sphenic number
Sphenic number
In number theory, a sphenic number is a positive integer which is the product of three distinct prime numbers.Note that this definition is more stringent than simply requiring the integer to have exactly three prime factors; e.g. 60 = 22 × 3 × 5 has exactly 3 prime factors, but is not sphenic.All...
. 70 is a Pell number
Pell number
In mathematics, the Pell numbers are an infinite sequence of integers that have been known since ancient times, the denominators of the closest rational approximations to the square root of 2. This sequence of approximations begins 1/1, 3/2, 7/5, 17/12, and 41/29, so the sequence of Pell numbers...
and a generalized heptagonal number, one of only two numbers to be both. Also, it is the seventh pentagonal number
Pentagonal number
A pentagonal number is a figurate number that extends the concept of triangular and square numbers to the pentagon, but, unlike the first two, the patterns involved in the construction of pentagonal numbers are not rotationally symmetrical...
and the fourth 13
13 (number)
13 is the natural number after 12 and before 14. It is the smallest number with eight letters in its name spelled out in English. It is also the first of the teens – the numbers 13 through 19 – the ages of teenagers....
-gonal number, as well as the fifth pentatope number
Pentatope number
A pentatope number is a number in the fifth cell of any row of Pascal's triangle starting with the 5-term row 1 4 6 4 1 either from left to right or from right to left.The first few numbers of this kind are :...
. It is the smallest weird number
Weird number
In number theory, a weird number is a natural number that is abundant but not semiperfect.In other words, the sum of the proper divisors of the number is greater than the number, but no subset of those divisors sums to the number itself.- Examples :The smallest weird number is 70...
.
Since it is possible to find sequences of 70 consecutive integers such that each inner member shares a factor with either the first or the last member, 70 is an Erdős–Woods number
Erdos–Woods number
In number theory, an Erdős–Woods number is a positive integer that has the following property:Consider a sequence of consecutive positive integers [a, a+1, \dots, a+k]. The number k is an Erdős–Woods number if there exists such a sequence, beginning with some number a, in which each of the elements...
.
In base 10, it is a Harshad number
Harshad number
A Harshad number, or Niven number in a given number base, is an integer that is divisible by the sum of its digits when written in that base. Harshad numbers were defined by D. R. Kaprekar, a mathematician from India. The word "Harshad" comes from the Sanskrit + , meaning joy-giver. The Niven...
.
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...
M70Messier 70Messier 70 is a globular cluster in the constellation Sagittarius. It was discovered by Charles Messier in 1780....
, a magnitude 9.0 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....
SagittariusSagittarius (constellation)Sagittarius is a constellation of the zodiac, the one containing the galactic center. Its name is Latin for the archer, and its symbol is , a stylized arrow. Sagittarius is commonly represented as a centaur drawing a bow... - 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 70, a magnitude 13.4 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 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... - 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 -821 September 5 and ended on 676 February. The duration of Saros series 70 was 1496.5 years, and it contained 84 solar eclipses. Further, 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 -519 June 13 and ended on 761 July. The duration of Saros series 70 was 1280.1 years, and it contained 72 lunar eclipses.
In religion
- Seventy souls went down to Egypt to begin the Hebrew's Egyptian exile (Genesis )
- According to Jewish traditionJudaismJudaism ) is the "religion, philosophy, and way of life" of the Jewish people...
, there is a core of 70 nations and 70 world languages. - In Jewish traditionJudaismJudaism ) is the "religion, philosophy, and way of life" of the Jewish people...
, there were 70 men in the Great SanhedrinSanhedrinThe Sanhedrin was an assembly of twenty-three judges appointed in every city in the Biblical Land of Israel.The Great Sanhedrin was the supreme court of ancient Israel made of 71 members...
, the Supreme Court of ancient Israel. (Sanhedrin 1:4). - Seventy elders were assembled by MosesMosesMoses was, according to the Hebrew Bible and Qur'an, a religious leader, lawgiver and prophet, to whom the authorship of the Torah is traditionally attributed...
on GodGodGod is the English name given to a singular being in theistic and deistic religions who is either the sole deity in monotheism, or a single deity in polytheism....
's command in the desert (Numbers ) - Ptolemy II PhiladelphusPtolemy II PhiladelphusPtolemy II Philadelphus was the king of Ptolemaic Egypt from 283 BCE to 246 BCE. He was the son of the founder of the Ptolemaic kingdom Ptolemy I Soter and Berenice, and was educated by Philitas of Cos...
ordered 72 Jewish elders to translate the TorahTorahTorah- A scroll containing the first five books of the BibleThe Torah , is name given by Jews to the first five books of the bible—Genesis , Exodus , Leviticus , Numbers and Deuteronomy Torah- A scroll containing the first five books of the BibleThe Torah , is name given by Jews to the first five...
into GreekGreek languageGreek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...
; the result was the Septuagint (from the Latin for "seventy") - The Roman numeral seventy, LXX, is the scholarly symbol for the Septuagint.
- In the Gospel of MatthewGospel of MatthewThe Gospel According to Matthew is one of the four canonical gospels, one of the three synoptic gospels, and the first book of the New Testament. It tells of the life, ministry, death, and resurrection of Jesus of Nazareth...
, , JesusJesusJesus of Nazareth , commonly referred to as Jesus Christ or simply as Jesus or Christ, is the central figure of Christianity...
tells PeterSaint PeterSaint Peter or Simon Peter was an early Christian leader, who is featured prominently in the New Testament Gospels and the Acts of the Apostles. The son of John or of Jonah and from the village of Bethsaida in the province of Galilee, his brother Andrew was also an apostle...
to forgive people seventy times seven times. - In the Gospel of LukeGospel of LukeThe Gospel According to Luke , commonly shortened to the Gospel of Luke or simply Luke, is the third and longest of the four canonical Gospels. This synoptic gospel is an account of the life and ministry of Jesus of Nazareth. It details his story from the events of his birth to his Ascension.The...
, JesusJesusJesus of Nazareth , commonly referred to as Jesus Christ or simply as Jesus or Christ, is the central figure of Christianity...
appoints Seventy DisciplesSeventy DisciplesThe seventy disciples or seventy-two disciples were early followers of Jesus mentioned in the Gospel of Luke . According to Luke, the only gospel in which they appear, Jesus appointed them and sent them out in pairs on a specific mission which is detailed in the text...
and sends them out in pairs to preach the Gospel. - Seventy, a priesthood office of The Church of Jesus Christ of Latter-day Saints.
- The Old Testament allots three score and ten (70 years) for a man's life (Psalm )
In sports
- NASCARNASCARThe National Association for Stock Car Auto Racing is a family-owned and -operated business venture that sanctions and governs multiple auto racing sports events. It was founded by Bill France Sr. in 1947–48. As of 2009, the CEO for the company is Brian France, grandson of the late Bill France Sr...
J. D. McDuffie was known for driving car #70 - in Olympic Archery, the targets are 70 meters from the archers
In other fields
70 is:- the designation of USAUnited StatesThe United States of America is a federal constitutional republic comprising fifty states and a federal district...
Interstate 70Interstate 70Interstate 70 is an Interstate Highway in the United States that runs from Interstate 15 near Cove Fort, Utah, to a Park and Ride near Baltimore, Maryland. It was the first Interstate Highway project in the United States. I-70 approximately traces the path of U.S. Route 40 east of the Rocky...
, a freeway that goes from UtahUtahUtah is a state in the Western United States. It was the 45th state to join the Union, on January 4, 1896. Approximately 80% of Utah's 2,763,885 people live along the Wasatch Front, centering on Salt Lake City. This leaves vast expanses of the state nearly uninhabited, making the population the...
to MarylandMarylandMaryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east... - Municipal Okrug 70, name of Kolomyagi Municipal Okrug of Primorsky District of Saint PetersburgSaint PetersburgSaint Petersburg is a city and a federal subject of Russia located on the Neva River at the head of the Gulf of Finland on the Baltic Sea...
, Russia, until February 2011 - In miles per hour, a common speed limitSpeed limitRoad speed limits are used in most countries to regulate the speed of road vehicles. Speed limits may define maximum , minimum or no speed limit and are normally indicated using a traffic sign...
for freeways in many AmericanUnited StatesThe United States of America is a federal constitutional republic comprising fifty states and a federal district...
states, primarily in the central United States (in the Eastern U.S. the speed limit is generally 65, in the Western U.S. it is 75). - In miles per hour, the national speed limit in the United KingdomUnited KingdomThe United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
(for cars and motorcycles on the best grades of road). - In years of marriage, the platinumPlatinumPlatinum is a chemical element with the chemical symbol Pt and an atomic number of 78. Its name is derived from the Spanish term platina del Pinto, which is literally translated into "little silver of the Pinto River." It is a dense, malleable, ductile, precious, gray-white transition metal...
wedding anniversaryWedding anniversary-Official recognition:In the Commonwealth realms, one can receive a message from the monarch for 60th, 65th, and 70th wedding anniversaries, and any wedding anniversary after that... - The hull numberHull classification symbolThe United States Navy, United States Coast Guard, and United States National Oceanic and Atmospheric Administration use hull classification symbols to identify their ship types and each individual ship within each type...
of the U.S. Navy's nuclear aircraft carrier USS Carl Vinson (CVN-70)USS Carl Vinson (CVN-70)The USS Carl Vinson is the third United States Navy Nimitz class supercarrier and is named after Carl Vinson, a Congressman from Georgia. Carl Vinson's callsign is "Gold Eagle". It played host to the first NCAA basketball game on an aircraft carrier on 11/11/11 between the University of North...
, named after U.S. Representative Carl VinsonCarl VinsonCarl Vinson was a United States Representative from Georgia. He was a Democrat and the first person to serve for more than 50 years in the United States House of Representatives...
. - The number of the French department Haute-SaôneHaute-SaôneHaute-Saône is a French department of the Franche-Comté région, named after the Saône River.- History :The department was created in the early years of the French Revolution through the application of a law dated 22 December 1789, from part of the former province of Franche-Comté...
- Historical years: AD 70, 70 BC70 BCYear 70 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Magnus and Dives...
, or 1970. - The number 70 is frequently referenced by the musical duo Boards of CanadaBoards of CanadaBoards of Canada are a Scottish electronic music duo consisting of brothers Mike Sandison and Marcus Eoin...
: they have songs titled "Sixtyten" (Music Has the Right to ChildrenMusic Has the Right to ChildrenMusic Has the Right to Children is the debut public album of the Scottish electronic music duo Boards of Canada. It was published by Warp Records and released on 20 April 1998 in Europe and 20 August in the United States...
, 1998) and "The Smallest Weird Number" (GeogaddiGeogaddiGeogaddi is the second album by Boards of Canada. It was released in February 2002 on three different days for each region to a large degree of anticipation. It presents a darker sound than its predecessor Music Has the Right to Children. The title of the album has no conclusive meaning; the...
, 2002), and their record label is named Music70Music70Music70 is a record label run by Boards of Canada. Boards of Canada used Music70 as a front to release many of their very early works. These albums were mostly distributed among friends and relatives and are, therefore, extremely rare. It has released only Boards of Canada's music, which is...
. - In the Far EastFar EastThe Far East is an English term mostly describing East Asia and Southeast Asia, with South Asia sometimes also included for economic and cultural reasons.The term came into use in European geopolitical discourse in the 19th century,...
ern culture of China, Japan, Korea, etc., 70 years old is called the Rare Age of the Olden Times (古稀 Guxi in ChineseChinese languageThe Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, 古稀 Koki in JapaneseJapanese languageis a language spoken by over 130 million people in Japan and in Japanese emigrant communities. It is a member of the Japonic language family, which has a number of proposed relationships with other languages, none of which has gained wide acceptance among historical linguists .Japanese is an...
, 고희 Kohwi in KoreanKorean languageKorean is the official language of the country Korea, in both South and North. It is also one of the two official languages in the Yanbian Korean Autonomous Prefecture in People's Republic of China. There are about 78 million Korean speakers worldwide. In the 15th century, a national writing...
, etc.), as written in one of Du FuDu FuDu Fu was a prominent Chinese poet of the Tang Dynasty.Along with Li Bai , he is frequently called the greatest of the Chinese poets. His greatest ambition was to serve his country as a successful civil servant, but he proved unable to make the necessary accommodations...
’s poems.
Number name
The FrenchFrance
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...
do not have a word for 70, instead using "soixante-dix" (60 + 10). Other French
French language
French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...
-speaking countries such as Belgium
Belgium
Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...
, Switzerland
Switzerland
Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....
, Aosta Valley and Jersey
Jersey
Jersey, officially the Bailiwick of Jersey is a British Crown Dependency off the coast of Normandy, France. As well as the island of Jersey itself, the bailiwick includes two groups of small islands that are no longer permanently inhabited, the Minquiers and Écréhous, and the Pierres de Lecq and...
do have a word for it, using "septante."