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167 (number)
167 (one hundred [and] sixty-seven) is the natural number following 166 (number), 166 and preceding 168 (number), 168. In mathematics 167 is an emirp, an isolated prime, a Chen prime, a Gaussian prime, a safe prime, and an Eisenstein prime with no imaginary part and a real part of the form 3n - 1. 167 is the smallest prime which can not be expressed as a sum of seven or fewer Cube (algebra), cubes. It is also the smallest number which requires six terms when expressed using the greedy algorithm as a sum of squares, 167 = 144 + 16 + 4 + 1 + 1 + 1, although by Lagrange's four-square theorem its non-greedy expression as a sum of squares can be shorter, e.g. 167 = 121 + 36 + 9 + 1. 167 is a full reptend prime in base 10, since the decimal expansion of 1/167 repeats the following 166 digits: 0.00598802395209580838323353293413173652694610778443113772455089820359281437125748502994 0119760479041916167664670658682634730538922155688622754491017964071856287425149700... 167 is a highly coto ... [...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] |
Asteroid
An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. Of the roughly one million known asteroids the greatest number are located between the orbits of Mars and Jupiter, approximately 2 to 4 AU from the Sun, in the main asteroid belt. Asteroids are generally classified to be of three types: C-type, M-type, and S-type. These were named after and are generally identified with carbonaceous, metallic, and silicaceous compositions, respectively. The size of asteroids varies greatly; the largest, Ceres, is almost across and qualifies as a dwarf planet. The total mass of all the asteroids combined is only 3% that of Earth's Moon. The majority of main belt asteroids follow slightly elliptical, stable orbits, revolving in the same direction as the Earth and taking from three to six years to comple ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martina Navratilova
Martina Navratilova ( cs, Martina Navrátilová ; ; born October 18, 1956) is a Czech–American, former professional tennis player. Widely considered among the greatest tennis players of all time, Navratilova won 18 major singles titles, 31 major women's doubles titles, and 10 major mixed doubles titles, for a combined total of 59 major titles, the most in the Open Era. Alongside Chris Evert, her greatest rival, Navratilova dominated women's tennis in the 1970s and 1980s. Navratilova was ranked as the world No. 1 in singles for a total of 332 weeks (second only to Steffi Graf), and for a record 237 weeks in doubles, making her the only player in history to have held the top spot in both disciplines for over 200 weeks. She won 167 top-level singles titles and 177 doubles titles, both the Open Era records. She won a record six consecutive singles majors across 1983 and 1984 while simultaneously winning the Grand Slam in doubles. Navratilova claims the best professional season w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rescue And Salvage Ship
Rescue and salvage ships (hull classification symbol ARS) are a type of military salvage tug. They are tasked with coming to the aid of stricken vessels. Their general mission capabilities include combat salvage, lifting, towing, retraction of grounded vessels, off-ship firefighting, and manned diving operations.http://www.msc.navy.mil/inventory/ships.asp?ship=188 Military Sealift Command Ship Inventory: Rescue Salvage Ships They were common during World War II. List of rescue and salvage ships of the United States Navy by class The following ship classes have been designated under the ARS hull classification symbol in United States Navy Service. ''Lapwing''-class minesweeper conversions The earliest designated United States Navy salvage ships (ARS) were converted s. Ships of this type were operated by the United States Navy as salvage ships from June 1941 until USS ''Viking'' was decommissioned and scrapped in 1953. * * * * * * * ''Diver'' class The United States Navy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Bomber
A light bomber is a relatively small and fast type of military bomber aircraft that was primarily employed before the 1950s. Such aircraft would typically not carry more than one ton of ordnance. The earliest light bombers were intended to drop their bombs in level flight over a target. During World War I some air forces began to distinguish between light bombers and the earliest purpose-built attack aircraft which carried out ground attack, close air support, anti-shipping and similar missions. After World War I, attack aircraft were typically identifiable by their ability to carry multiple fixed machine guns, automatic cannons and rockets in addition to bombs. Light bombers have often served as attack aircraft and vice versa. Purpose-built light bombers disappeared from military aviation by the end of World War II, as advancements in propulsion and aeronautical design enabled newer attack/strike aircraft, fighter-bombers, and multirole aircraft types to deliver equal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martin Maryland
The Martin Model 167 Maryland was an American medium bomber that first flew in 1939. It saw action in World War II with France and the United Kingdom. Design and development In response to a December 1937 United States Army Air Corps requirement for an attack aircraft capable of carrying a bombload of over a range of at a speed of , the Glenn L. Martin Company produced its Model 167, which was given the official designation XA-22, competing with designs from Bell Aircraft (the Model 9), Douglas (the Douglas DB-7), North American (the NA-40) and Stearman (the Stearman XA-21). Martin's design was a twin-engine all-metal monoplane, capable of around 310 mph (500 km/h) with a crew of three. The XA-22 was not adopted for operational service in the U.S., because the contract was won by the Douglas DB-7, which became the A-20 Havoc, but Martin received foreign orders, and about 450 of the fast, twin-engined bombers were built. The prototype Model 167W was powered by twin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicopter
A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of STOL (Short TakeOff and Landing) or STOVL (Short TakeOff and Vertical Landing) aircraft cannot perform without a runway. In 1942, the Sikorsky R-4 became the first helicopter to reach full-scale production.Munson 1968.Hirschberg, Michael J. and David K. Dailey"Sikorsky". ''US and Russian Helicopter Development in the 20th Century'', American Helicopter Society, International. 7 July 2000. Although most earlier designs used more than one main rotor, the configuration of a single main rotor accompanied by a vertical anti-torque tail rotor (i.e. unicopter, not to be confused with the single-blade monocopter) has become the most comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Marine Corps
The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combined arms, implementing its own infantry, artillery, aerial, and special operations forces. The U.S. Marine Corps is one of the eight uniformed services of the United States. The Marine Corps has been part of the U.S. Department of the Navy since 30 June 1834 with its sister service, the United States Navy. The USMC operates installations on land and aboard sea-going amphibious warfare ships around the world. Additionally, several of the Marines' tactical aviation squadrons, primarily Marine Fighter Attack squadrons, are also embedded in Navy carrier air wings and operate from the aircraft carriers. The history of the Marine Corps began when two battalions of Continental Marines were formed on 10 November 1775 in Philadelphia as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HMLA-167
Marine Light Attack Helicopter Squadron 167 (HMLA-167) is a United States Marine Corps helicopter squadron consisting of AH-1W SuperCobra attack helicopters and UH-1Y Venom utility helicopters. Known as the "''Warriors''", they are based at Marine Corps Air Station New River, North Carolina and fall under the command of Marine Aircraft Group 29 (MAG-29) and the 2nd Marine Aircraft Wing (2nd MAW). Mission Support the Marine Air-Ground Task Force commander by providing offensive air support, utility support, armed escort and airborne supporting arms coordination, day or night under all weather conditions during expeditionary, joint or combined operations. History Vietnam War Marine Light Helicopter Squadron 167 was commissioned on March 15, 1968, at Marble Mountain Air Facility, Republic of Vietnam. From commissioning date until June 1971, HML-167 would participate in operations against communist forces in the Republic of Vietnam. Flying UH-1Es for the duration of its tenure in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galaxy
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million stars, to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy's center of mass. Most of the mass in a typical galaxy is in the form of dark matter, with only a few percent of that mass visible in the form of stars and nebulae. Supermassive black holes are a common feature at the centres of galaxies. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. Many are thought to have supermassive black holes at their centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun. As o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IC 167
IC 167 is a barred spiral galaxy in the constellation of Aries. It was first reported by Bigourdan in 1891 and included in Dreyer's first ''Index Catalogue''. Galaxy group information IC 167 is a member of the NGC 697 group. There is some evidence that IC 167 is interacting Interaction is action that occurs between two or more objects, with broad use in philosophy and the sciences. It may refer to: Science * Interaction hypothesis, a theory of second language acquisition * Interaction (statistics) * Interactions o ... with nearby NGC 694 as they seem to share HI regions. The tidal warping of IC 167 also is indicative of an interaction with another galaxy. How long the interaction between these two galaxies has been occurring is the subject of current research. References External links * * {{Ugc15 IC 0167 0167 01313 031 6833 Interacting galaxies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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