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243 (number)
243 (two hundred ndforty-three) is the natural number following 242 and preceding 244. In mathematics 243 is: *the only 3-digit number that is a fifth power (35). *a perfect totient number. *the sum of five consecutive prime numbers (41 + 43 + 47 + 53 + 59). *an 82- gonal number. In other fields 243 is: * the Calling code for the Democratic Republic of the Congo, the country once known as Zaire. * the year 243 AD or 243 BC. * an Aircraft emergency frequency (243.0 MHz) for military aircraft. * Aloha Airlines Flight 243 which suffered an explosive decompression near Maui, HI on April 28, 1988 * .243 Winchester and .243 WSSM, rifle rounds * The number of Earth Days for the planet Venus Venus is the second planet from the Sun. It is sometimes called Earth's "sister" or "twin" planet as it is almost as large and has a similar composition. As an interior planet to Earth, Venus (like Mercury) appears in Earth's sky never f ... to complete one Venusian day, one revolu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural Number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''Cardinal number, cardinal numbers'', and numbers used for ordering are called ''Ordinal number, ordinal numbers''. Natural numbers are sometimes used as labels, known as ''nominal numbers'', having none of the properties of numbers in a mathematical sense (e.g. sports Number (sports), jersey numbers). Some definitions, including the standard ISO/IEC 80000, ISO 80000-2, begin the natural numbers with , corresponding to the non-negative integers , whereas others start with , corresponding to the positive integers Texts that exclude zero from the natural numbers sometimes refer to the natural numbers together with zero as the whole numbers, while in other writings, that term is used instead for the integers (including negative integers). The natural ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
242 (number)
242 (two hundred ndforty-two) is the natural number following 241 and preceding 243. In mathematics 242 is the smallest integer to start a run of four consecutive integers with the same number of divisors. 242 is a nontotient since there is no integer with 242 coprimes below it. 242 is a palindrome. 242 is the number of parallelogram polyominoes with 8 cells. In other fields 242 is also: * part of the name of a Belgian electronic body music group called Front 242 * the number of a notable UN Security Council resolution pertaining to the Arab/Israeli conflict, United Nations Security Council Resolution 242 * Area code 242 is the area code of The Bahamas located in the North West Atlantic Ocean. * Volvo 242 (2xx-series, 4-cylinder, 2-door) Produced from 1974 to 1984. * Fiat 242, a van produced by Fiat * the total number oPower Starsa player can collect in ''Super Mario Galaxy'' and ''Super Mario Galaxy 2'' for the Wii. * the orbit, in days, of Kepler-69c, a planet 70 per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
244 (number)
244 (two hundred ndforty-four) is the natural number following 243 and preceding 245. In mathematics 244 is: *the sum of two nonzero fifth powers (). *palindromic in bases 3 (1000013), 11 (20211), 60 (4460), 121 (22121), 243 (11243). *a Harshad number in bases 3, 9, 11, 61, 62, 81, 121, 122, 123 and 184. *the second anti-perfect number, meaning that reversing the digits of the proper divisors of 244 and adding the results gives 244 back again. *part of the sequence 1, 2, 4, 8, 61, 221, 244, ... in which each number is formed by reversing the digits of the double of the previous number. *the number of non-isomorphic set-systems of weight 8 In other fields *The years 244 and 244 BC *Dialing code for Angola. *It is considered a lucky number in several areas of the United Arab Emirates; specifically Dubai Dubai (, ; ar, دبي, translit=Dubayy, , ) is the most populous city in the United Arab Emirates (UAE) and the capital of the Emirate of Dubai, the most populated of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perfect Totient Number
In number theory, a perfect totient number is an integer that is equal to the sum of its iterated totients. That is, we apply the totient function to a number ''n'', apply it again to the resulting totient, and so on, until the number 1 is reached, and add together the resulting sequence of numbers; if the sum equals ''n'', then ''n'' is a perfect totient number. For example, there are six positive integers less than 9 and relatively prime to it, so the totient of 9 is 6; there are two numbers less than 6 and relatively prime to it, so the totient of 6 is 2; and there is one number less than 2 and relatively prime to it, so the totient of 2 is 1; and , so 9 is a perfect totient number. The first few perfect totient numbers are : 3, 9, 15, 27, 39, 81, 111, 183, 243, 255, 327, 363, 471, 729, 2187, 2199, 3063, 4359, 4375, ... . In symbols, one writes :\varphi^i(n) = \begin \varphi(n), &\text i = 1 \\ \varphi(\varphi^(n)), &\text i \geq 2 \end for the iterated totient function ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prime Number
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, or , involve 5 itself. However, 4 is composite because it is a product (2 × 2) in which both numbers are smaller than 4. Primes are central in number theory because of the fundamental theorem of arithmetic: every natural number greater than 1 is either a prime itself or can be factorized as a product of primes that is unique up to their order. The property of being prime is called primality. A simple but slow method of checking the primality of a given number n, called trial division, tests whether n is a multiple of any integer between 2 and \sqrt. Faster algorithms include the Miller–Rabin primality test, which is fast but has a small chance of error, and the AKS primality test, which always pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polygonal Number
In mathematics, a polygonal number is a number represented as dots or pebbles arranged in the shape of a regular polygon. The dots are thought of as alphas (units). These are one type of 2-dimensional figurate numbers. Definition and examples The number 10 for example, can be arranged as a triangle (see triangular number): : But 10 cannot be arranged as a square (geometry), square. The number 9, on the other hand, can be (see square number): : Some numbers, like 36, can be arranged both as a square and as a triangle (see square triangular number): : By convention, 1 is the first polygonal number for any number of sides. The rule for enlarging the polygon to the next size is to extend two adjacent arms by one point and to then add the required extra sides between those points. In the following diagrams, each extra layer is shown as in red. Triangular numbers : Square numbers : Polygons with higher numbers of sides, such as pentagons and hexagons, can also be constructe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Democratic Republic Of The Congo
The Democratic Republic of the Congo (french: République démocratique du Congo (RDC), colloquially "La RDC" ), informally Congo-Kinshasa, DR Congo, the DRC, the DROC, or the Congo, and formerly and also colloquially Zaire, is a country in Central Africa. It is bordered to the northwest by the Republic of the Congo, to the north by the Central African Republic, to the northeast by South Sudan, to the east by Uganda, Rwanda, and Burundi, and by Tanzania (across Lake Tanganyika), to the south and southeast by Zambia, to the southwest by Angola, and to the west by the South Atlantic Ocean and the Cabinda exclave of Angola. By area, it is the second-largest country in Africa and the 11th-largest in the world. With a population of around 108 million, the Democratic Republic of the Congo is the most populous officially Francophone country in the world. The national capital and largest city is Kinshasa, which is also the nation's economic center. Centered on the Cong ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zaire
Zaire (, ), officially the Republic of Zaire (french: République du Zaïre, link=no, ), was a Congolese state from 1971 to 1997 in Central Africa that was previously and is now again known as the Democratic Republic of the Congo. Zaire was, by area, the third-largest country in Africa (after Sudan and Algeria), and the 11th-largest country in the world. With a population of over 23 million inhabitants, Zaire was the most-populous officially Francophone country in Africa, as well as one of the most populous in Africa. The country was a one-party totalitarian military dictatorship, run by Mobutu Sese Seko and his ruling Popular Movement of the Revolution party. Zaire was established following Mobutu's seizure of power in a military coup in 1965, following five years of political upheaval following independence from Belgium known as the Congo Crisis. Zaire had a strongly centralist constitution, and foreign assets were nationalized. The period is sometimes referred to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
243 BC
__NOTOC__ Year 243 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Fundulus and Galus (or, less frequently, year 511 '' Ab urbe condita''). The denomination 243 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Egypt * Ptolemy III returns from Syria due to a revolt in Egypt. As a result, Seleucus II is able to regain control of his kingdom with the Egyptians being pushed out of Mesopotamia and part of Northern Syria. * Ptolemy III returns from his conquests of Seleucid territory with a large amount of treasure and works of art, including many statues of Egyptian gods carried off to Persia by Cambyses. He restores the statues to the Egyptian temples and earns the title of Euergetes ("Benefactor"). Greece * Without a declaration of hostilities, Greek statesman, Aratus of Sicyon, who has gradua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aircraft Emergency Frequency
The aircraft emergency frequency (also known as GUARD) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress. The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD) or VHF Guard, and 243.0 MHz—the second harmonic of VHF guard—for military use, also known as Military Air Distress (MAD) or UHF Guard. Earlier emergency locator transmitters (ELTs) used the guard frequencies to transmit, but an additional frequency of 406 MHz is used by a more modern emergency locator transmitter. History The choice of 121.5 MHz was made by ICAO in conjunction with ARINC and the ITU. Monitoring In the United States, the emergency frequency is monitored by most air traffic control towers, FSS services, national air traffic control centers, military air defense and other flight and emergency services, as well as by many commercial aircraft. The notice to airmen FDC 4/4386 requires "…all aircr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aloha Airlines Flight 243
Aloha Airlines Flight 243 (IATA: AQ243, ICAO: AAH243) was a scheduled Aloha Airlines flight between Hilo and Honolulu in Hawaii. On April 28, 1988, a Boeing 737-297 serving the flight suffered extensive damage after an explosive decompression in flight, caused by part of the fuselage breaking due to poor maintenance and metal fatigue. The plane was able to land safely at Kahului Airport on Maui. The one fatality, flight attendant Clarabelle "C.B." Lansing, was ejected from the airplane. Another 65 passengers and crew were injured. The substantial damage inflicted by the decompression, the loss of one cabin crew member, and the safe landing of the aircraft established the incident as a significant event in the history of aviation, with far-reaching effects on aviation safety policies and procedures. Aircraft and crew The aircraft involved was a Boeing 737 200 series and was the 152nd Boeing 737 airframe built at the Renton assembly plant. It was built in 1969 and delivered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maui, HI
The island of Maui (; Hawaiian: ) is the second-largest of the islands of the state of Hawaii at 727.2 square miles (1,883 km2) and is the 17th largest island in the United States. Maui is the largest of Maui County's four islands, which also includes Molokai, Lānai, and unpopulated Kahoolawe. In 2020, Maui had a population of 168,307, the third-highest of the Hawaiian Islands, behind that of Oahu and Hawaii Island. Kahului is the largest census-designated place (CDP) on the island with a population of 26,337 , and is the commercial and financial hub of the island. Wailuku is the seat of Maui County and is the third-largest CDP . Other significant places include Kīhei (including Wailea and Makena in the Kihei Town CDP, the island's second-most-populated CDP), Lāhainā (including Kāanapali and Kapalua in the Lāhainā Town CDP), Makawao, Pukalani, Pāia, Kula, Haikū, and Hāna. Etymology Native Hawaiian tradition gives the origin of the island's name in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
