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184 (number)
184 (one hundred ndeighty-four) is the natural number following 183 and preceding 185. In mathematics There are 184 different Eulerian graphs on eight unlabeled vertices, and 184 paths by which a chess rook can travel from one corner of a 4 × 4 chessboard to the opposite corner without passing through the same square twice. 184 is also a refactorable number. In other fields Some physicists have proposed that 184 is a magic number for neutrons in atomic nuclei. In poker, with one or more jokers as wild cards, there are 184 different straight flushes. See also * The year AD 184 or 184 BC * List of highways numbered 184 The following highways are numbered 184: Ireland * R184 road (Ireland) Japan * Japan National Route 184 Poland * Voivodeship road 184 (Poland), Voivodeship road 184 United States * Interstate 184 * Alabama State Route 184 * Arkansas Highway ... * References {{DEFAULTSORT:184 (Number) Integers ... [...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] |
183 (number)
183 (one hundred ndeighty-three) is the natural number following 182 and preceding 184. In mathematics 183 is a perfect totient number, a number that is equal to the sum of its iterated totients Because 183 = 13^2 + 13 + 1, it is the number of points in a projective plane over the finite field \mathbb_. 183 is the fourth element of a divisibility sequence 1,3,13,183,\dots in which the nth number a_n can be computed as a_n=a_^2+a_+1=\bigl\lfloor x^\bigr\rfloor, for a transcendental number x\approx 1.38509. This sequence counts the number of trees of height \le n in which each node can have at most two children. There are 183 different semiorders on four labeled elements. See also * The year AD 183 or 183 BC __NOTOC__ Year 183 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Marcellus and Labeo (or, less frequently, year 571 ''Ab urbe condita''). The denomination 183 BC for this year has been ... * List of highways ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
185 (number)
185 (one hundred ndeighty-five) is the natural number following 184 and preceding 186. In mathematics There are 185 different directed graphs on four unlabeled vertices that have at least one sink vertex, with no outgoing edges, 185 ways of permuting the squares of a 2\times 4 grid of squares in such a way that each square is one unit away from its original position horizontally, vertically, or diagonally, and 185 matroids on five labeled elements in which each element participates in at least one basis. The Spiral of Theodorus is formed by unit-length line segments that, together with the center point of the spiral, form right triangles. 185 of these right triangles fit within the first four turns of this spiral. See also * The year AD 185 or 185 BC __NOTOC__ Year 185 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Pulcher and Puditanus (or, less frequently, year 569 '' Ab urbe condita''). The denomination 185 BC f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eulerian Graph
In graph theory, an Eulerian trail (or Eulerian path) is a trail in a finite graph that visits every edge exactly once (allowing for revisiting vertices). Similarly, an Eulerian circuit or Eulerian cycle is an Eulerian trail that starts and ends on the same vertex. They were first discussed by Leonhard Euler while solving the famous Seven Bridges of Königsberg problem in 1736. The problem can be stated mathematically like this: :Given the graph in the image, is it possible to construct a path (or a cycle; i.e., a path starting and ending on the same vertex) that visits each edge exactly once? Euler proved that a necessary condition for the existence of Eulerian circuits is that all vertices in the graph have an even degree, and stated without proof that connected graphs with all vertices of even degree have an Eulerian circuit. The first complete proof of this latter claim was published posthumously in 1873 by Carl Hierholzer. This is known as Euler's Theorem: :A connected g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chess Rook
The rook (; ♖, ♜) is a piece in the game of chess. It may move any number of squares horizontally or vertically without jumping, and it may an enemy piece on its path; additionally, it may participate in castling. Each player starts the game with two rooks, one in each corner on their own side of the board. Formerly, the rook (from Persian رخ ''rokh''/''rukh'', meaning "chariot") was alternatively called the tower, marquess, rector, and comes (count or earl). The term "castle" is considered to be informal, incorrect, or old-fashioned. Placement and movement The white rooks start on squares a1 and h1, while the black rooks start on a8 and h8. The rook moves horizontally or vertically, through any number of unoccupied squares (see diagram). The rook cannot jump over pieces. The rook may capture an enemy piece by moving to the square on which the enemy piece stands, removing it from play. The rook also participates with the king in a special move called castling, wherein it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Refactorable Number
A refactorable number or tau number is an integer ''n'' that is divisible by the count of its divisors, or to put it algebraically, ''n'' is such that \tau(n)\mid n. The first few refactorable numbers are listed in as : 1, 2, 8, 9, 12, 18, 24, 36, 40, 56, 60, 72, 80, 84, 88, 96, 104, 108, 128, 132, 136, 152, 156, 180, 184, 204, 225, 228, 232, 240, 248, 252, 276, 288, 296, ... For example, 18 has 6 divisors (1 and 18, 2 and 9, 3 and 6) and is divisible by 6. There are infinitely many refactorable numbers. Properties Cooper and Kennedy proved that refactorable numbers have natural density zero. Zelinsky proved that no three consecutive integers can all be refactorable. Colton proved that no refactorable number is perfect. The equation \gcd(n,x) = \tau(n) has solutions only if n is a refactorable number, where \gcd is the greatest common divisor function. Let T(x) be the number of refactorable numbers which are at most x. The problem of determining an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magic Number (physics)
In nuclear physics, a magic number is a number of nucleons (either protons or neutrons, separately) such that they are arranged into complete shells within the atomic nucleus. As a result, atomic nuclei with a 'magic' number of protons or neutrons are much more stable than other nuclei. The seven most widely recognized magic numbers as of 2019 are 2, 8, 20, 28, 50, 82, and 126 . For protons, this corresponds to the elements helium, oxygen, calcium, nickel, tin, lead and the hypothetical unbihexium, although 126 is so far only known to be a magic number for neutrons. Atomic nuclei consisting of such a magic number of nucleons have a higher average binding energy per nucleon than one would expect based upon predictions such as the semi-empirical mass formula and are hence more stable against nuclear decay. The unusual stability of isotopes having magic numbers means that transuranium elements could theoretically be created with extremely large nuclei and yet not be subject to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poker
Poker is a family of comparing card games in which players wager over which hand is best according to that specific game's rules. It is played worldwide, however in some places the rules may vary. While the earliest known form of the game was played with just 20 cards, today it is usually played with a standard deck, although in countries where short packs are common, it may be played with 32, 40 or 48 cards.Parlett (2008), pp. 568–570. Thus poker games vary in deck configuration, the number of cards in play, the number dealt face up or face down, and the number shared by all players, but all have rules that involve one or more rounds of betting. In most modern poker games, the first round of betting begins with one or more of the players making some form of a forced bet (the '' blind'' or ''ante''). In standard poker, each player bets according to the rank they believe their hand is worth as compared to the other players. The action then proceeds clockwise as each play ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wild Card (cards)
A wild card in card games is one that may be used to represent any other playing card, sometimes with certain restrictions. These may be jokers, for example in Rummy games, or ordinary ranked and suited cards may be designated as wild cards such as the and in Classic Brag or the "deuces wild" in Poker.''The Language of Cards: A glossary of card-playing terms'' by David Parlett at www.parlettgames.uk. Retrieved 1 Jun 2018. A card that is not wild may be referred to as a . Jokers, however, may also have other uses, such as being a permanent top trump. Use In most cases, the wild card or cards must be agreed upon by all players before t ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Straight Flush
In poker, players form sets of five playing cards, called ''hands'', according to the rules of the game. Each hand has a rank, which is compared against the ranks of other hands participating in the showdown to decide who wins the pot. In high games, like Texas hold 'em and seven-card stud, the highest-ranking hands win. In low games, like razz, the lowest-ranking hands win. In high-low split games, both the highest-ranking ''and'' lowest-ranking hands win, though different rules are used to rank the high and low hands. Each hand belongs to a category determined by the patterns formed by its cards. A hand in a higher-ranking category always ranks higher than a hand in a lower-ranking category. A hand is ranked within its category using the ranks of its cards. Individual cards are ranked, from highest to lowest: A, K, Q, J, 10, 9, 8, 7, 6, 5, 4, 3 and 2. However, aces have the lowest rank under ace-to-five low or ace-to-six low rules, or under high rules as part of a five-high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
184 BC
__NOTOC__ Year 184 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Pulcher and Licinus (or, less frequently, year 570 ''Ab urbe condita''). The denomination 184 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 Roman Republic * Cato the Elder, along with his colleague, Lucius Valerius Flaccus, are elected censors in Rome. Already the champion of the ancient, austere Roman way of life, Cato, now inaugurates a puritanical campaign. He aims at preserving the ''mos maiorum,'' ("ancestral custom") and combating all Greek influences, which he believes are undermining the older Roman standards of morality. He passes measures taxing luxury and strictly revises the list of persons eligible for the Senate. Abuses by tax gatherers are brought under control, and public building is promoted as a worthy cause. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Highways Numbered 184
The following highways are numbered 184: Ireland * R184 road (Ireland) Japan * Japan National Route 184 Poland * Voivodeship road 184 United States * Interstate 184 * Alabama State Route 184 * Arkansas Highway 184 * California State Route 184 * Colorado State Highway 184 * Connecticut Route 184 * Georgia State Route 184 * Illinois Route 184 * Iowa Highway 184 (former) * K-184 (Kansas highway) * Kentucky Route 184 * Louisiana Highway 184 * Maine State Route 184 * M-184 (Michigan highway) (former) * Mississippi Highway 184 * New Jersey Route 184 * New Mexico State Road 184 * New York State Route 184 * North Carolina Highway 184 * Ohio State Route 184 * Pennsylvania Route 184 * South Carolina Highway 184 * Tennessee State Route 184 * Texas State Highway 184 ** Farm to Market Road 184 (Texas) * Utah State Route 184 (1935-1963) in Provo * Utah State Route 184 (1963-2007) in Salt Lake City (former) * Virginia State Route 184 * Wisconsin Highway 184 (former) ;Territori ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
