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207 (number)
207 (two hundred ndseven) is the natural number following 206 and preceding 208. It is an odd composite number with a prime factorization of 3^2\cdot 23. In Mathematics 207 is a Wedderburn-Etherington number. There are exactly 207 different matchstick graphs with eight edges. 207 is also a deficient number, as 207's proper divisors (divisors not including the number itself) only add up to 105: 1+3+9+23+69=105<207. See also *Peugeot 207
The Peugeot 207 is a supermini car ( B) that was designed and produced by the French automaker Peugeot from 2006 to 2014. It was presented at the Geneva Motor Show in 2006, and entered production in April 2006, as the successor to the Peugeo ...
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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] |
206 (number)
206 (two hundred ndsix) is the natural number following 205 and preceding 207. In mathematics 206 is both a nontotient and a noncototient. 206 is an untouchable number. It is the lowest positive integer (when written in English as "two hundred and six") to employ all of the vowels once only, not including Y. The other numbers sharing this property are 230, 250, 260, 602, 640, 5000, 8000, 9000, 80,000 and 90,000. 206 and 207 form the second pair of consecutive numbers (after 14 and 15) whose sums of divisors are equal. There are exactly 206 different linear forests on five labeled nodes, and exactly 206 regular semigroups of order four up to isomorphism and anti-isomorphism. In science There are 206 bones in the typical adult human body.. See also * The Year 206 AD * Cessna 206, a single engine light aircraft * Bell 206, a light helicopter * The Peugeot 206, a French supermini automobile * US Area code 206, and The 206 slang terminology for the urban part of the greater ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
208 (number)
208 (two hundred ndeight) is the natural number following 207 and preceding 209. 208 is a practical number, a tetranacci number, a rhombic matchstick number, a happy number, and a member of Aronson's sequence. There are exactly 208 five-bead necklaces A necklace is an article of jewellery that is worn around the neck. Necklaces may have been one of the earliest types of adornment worn by humans. They often serve ceremonial, religious, magical, or funerary purposes and are also used as symbol ... drawn from a set of beads with four colors, and 208 generalized weak orders on three labeled points.. References Integers {{Number-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Composite Number
A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Equivalently, it is a positive integer that has at least one divisor other than 1 and itself. Every positive integer is composite, prime, or the unit 1, so the composite numbers are exactly the numbers that are not prime and not a unit. For example, the integer 14 is a composite number because it is the product of the two smaller integers 2 × 7. Likewise, the integers 2 and 3 are not composite numbers because each of them can only be divided by one and itself. The composite numbers up to 150 are: :4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, 110, 111, 112, 114, 115, 116, 117, 118, 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prime Factorization
In number theory, integer factorization is the decomposition of a composite number into a product of smaller integers. If these factors are further restricted to prime numbers, the process is called prime factorization. When the numbers are sufficiently large, no efficient non-quantum integer factorization algorithm is known. However, it has not been proven that such an algorithm does not exist. The presumed difficulty of this problem is important for the algorithms used in cryptography such as RSA public-key encryption and the RSA digital signature. Many areas of mathematics and computer science have been brought to bear on the problem, including elliptic curves, algebraic number theory, and quantum computing. In 2019, Fabrice Boudot, Pierrick Gaudry, Aurore Guillevic, Nadia Heninger, Emmanuel Thomé and Paul Zimmermann factored a 240-digit (795-bit) number (RSA-240) utilizing approximately 900 core-years of computing power. The researchers estimated that a 1024-bit RSA mod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Matchstick Graph
In geometric graph theory, a branch of mathematics, a matchstick graph is a graph that can be drawn in the plane in such a way that its edges are line segments with length one that do not cross each other. That is, it is a graph that has an embedding which is simultaneously a unit distance graph and a plane graph. For this reason, matchstick graphs have also been called planar unit-distance graphs. Informally, matchstick graphs can be made by placing noncrossing matchsticks on a flat surface, hence the name. Regular matchstick graphs Much of the research on matchstick graphs has concerned regular graphs, in which each vertex has the same number of neighbors. This number is called the degree of the graph. Regular matchstick graphs can have degree 0, 1, 2, 3, or 4. The complete graphs with one, two, and three vertices (a single vertex, a single edge, and a triangle) are all matchstick graphs and are 0-, 1-, and 2-regular respectively. The smallest 3-regular matchstick graph is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deficient Number
In number theory, a deficient number or defective number is a number ''n'' for which the sum of divisors of ''n'' is less than 2''n''. Equivalently, it is a number for which the sum of proper divisors (or aliquot sum) is less than ''n''. For example, the proper divisors of 8 are 1, 2, and 4, and their sum is less than 8, so 8 is deficient. Denoting by ''σ''(''n'') the sum of divisors, the value 2''n'' − ''σ''(''n'') is called the number's deficiency. In terms of the aliquot sum ''s''(''n''), the deficiency is ''n'' − ''s''(''n''). Examples The first few deficient numbers are :1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 21, 22, 23, 25, 26, 27, 29, 31, 32, 33, 34, 35, 37, 38, 39, 41, 43, 44, 45, 46, 47, 49, 50, ... As an example, consider the number 21. Its divisors are 1, 3, 7 and 21, and their sum is 32. Because 32 is less than 42, the number 21 is deficient. Its deficiency is 2 × 21 − 32 = 10. Properties Since the aliquot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
105 (number)
105 (one hundred ndfive) is the natural number following 104 and preceding 106. In mathematics 105 is a triangular number, a dodecagonal number, and the first Zeisel number. It is the first odd sphenic number and is the product of three consecutive prime numbers. 105 is the double factorial of 7. It is also the sum of the first five square pyramidal numbers. 105 comes in the middle of the prime quadruplet (101, 103, 107, 109). The only other such numbers less than a thousand are 9, 15, 195, and 825. 105 is also the middle of the only prime sextuplet (97, 101, 103, 107, 109, 113) between the ones occurring at 7-23 and at 16057–16073. As the product of the first three odd primes (3\times5\times7) and less than the square of the next prime (11) by > 8, for n=105, n ± 2, ± 4, and ± 8 must be prime, and n ± 6, ± 10, ± 12, and ± 14 must be composite (prime gap). 105 is also a pseudoprime to the prime bases 13, 29, 41, 43, 71, 83, and 97. The distinct prime factors of 105 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peugeot 207
The Peugeot 207 is a supermini car ( B) that was designed and produced by the French automaker Peugeot from 2006 to 2014. It was presented at the Geneva Motor Show in 2006, and entered production in April 2006, as the successor to the Peugeot 206. It shares the same platform with the Citroën C3. The Peugeot 207 was replaced in April 2012 by the Peugeot 208, which is built on the same platform. Launch The 207 was launched in France, Spain, and Italy during April 2006, and later on in other markets in Europe and the Middle East. In January 2004, Peugeot decided not to manufacture the 207 in Ryton. The launch for the United Kingdom was on 8 June 2006. Amicus and the TGWU, both unions representing workers at PSA's manufacturing plant in Ryton, Coventry, chose the same day to launch a campaign calling for the boycott of PSA's Peugeot and Citroën vehicles in the United Kingdom, to protest against the company's plans to close the plant. Peugeot's United Kingdom sales grew, d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Highways Numbered 207
The following highways are numbered 207: Canada * Manitoba Provincial Road 207 * Nova Scotia Route 207 * Prince Edward Island Route 207 * Quebec Route 207 China * China National Highway 207 Costa Rica * National Route 207 (Costa Rica), National Route 207 Japan * Route 207 (Japan) United States * Alabama State Route 207 * California State Route 207 * Connecticut Route 207 * Florida State Road 207 * Georgia State Route 207 (former) * Iowa Highway 207 (former) * Kentucky Route 207 * Maine State Route 207 * Montana Secondary Highway 207 * Nevada State Route 207 * New Mexico State Road 207 * New York State Route 207 * North Carolina Highway 207 * Ohio State Route 207 * Oregon Route 207 * South Carolina Highway 207 * Tennessee State Route 207 * Texas State Highway 207 ** Texas State Highway Loop 207 * Utah State Route 207 (other), Utah State Route 207 (former) * Vermont Route 207 * Virginia State Route 207 * [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
