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104 relations: Abundant number, Amicable numbers, Antwerp, Atari 2600, Balanced prime, Belgium, Blue box, Cal Ripken Jr., Carmichael number, Centered cube number, Centered heptagonal number, Centered octagonal number, Centered pentagonal number, Centered square number, Chess rating system, Colossally abundant number, Cousin prime, Cuban prime, Cube, Decagonal number, Decimal, Democratic Party presidential candidates, 2016, Denmark, Eight queens puzzle, Erdős–Nicolas number, Euler's totient function, Factorial, Fibonacci number, Frederiksberg, Generalizations of Fibonacci numbers, Generalized Riemann hypothesis, Happy number, Harmonic divisor number, Harry Potter and the Chamber of Secrets, Harry Potter and the Philosopher's Stone, Harry Potter and the Prisoner of Azkaban, Harshad number, Hertz, Highly cototient number, Hikaru Sulu, Kaprekar number, Keith number, Leyland number, List of Unilever brands, Long-distance calling, Lucas number, Lucas–Carmichael number, Magic constant, Magic square, Markov number, ..., Mersenne prime, Mertens function, Mian–Chowla sequence, Motzkin number, Natural number, Nonagonal number, Octahedral number, Padovan sequence, Palindromic number, Pell number, Pentagonal pyramidal number, Perfect totient number, Power of two, Primorial, Primorial prime, Product (mathematics), Pronic number, Proth number, Ramanujan's ternary quadratic form, Repdigit, Repunit, Roman numerals, Ruth–Aaron pair, Safe prime, SAT, Sexy prime, Smarandache–Wellin number, Smith number, Sophie Germain prime, Sphenic number, Square pyramidal number, Star number, Star Trek, Super-Poulet number, Super-prime, Superior highly composite number, Sydney, Tetrahedral number, Triangular number, Twin prime, United States Chess Federation, Vampire number, Video game console, Wagstaff prime, Wedderburn–Etherington number, Windows 2000, Woodall number, 1, 2112 (album), 2520 (number), 2600: The Hacker Quarterly, 360 (number), 420 (number), 60 (number). Expand index (54 more) »
Abundant number
In number theory, an abundant number or excessive number is a number for which the sum of its proper divisors is greater than the number itself.
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Amicable numbers
Amicable numbers are two different numbers so related that the sum of the proper divisors of each is equal to the other number.
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Antwerp
Antwerp (Antwerpen, Anvers) is a city in Belgium, and is the capital of Antwerp province in Flanders.
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Atari 2600
The Atari 2600 (or Atari Video Computer System before November 1982) is a home video game console from Atari, Inc. Released on September 11, 1977, it is credited with popularizing the use of microprocessor-based hardware and games contained on ROM cartridges, a format first used with the Fairchild Channel F in 1976.
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Balanced prime
In number theory, a balanced prime is a prime number with equal-sized prime gaps above and below it, so that it is equal to the arithmetic mean of the nearest primes above and below.
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Belgium
Belgium, officially the Kingdom of Belgium, is a country in Western Europe bordered by France, the Netherlands, Germany and Luxembourg.
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Blue box
A blue box is an electronic device that generates the in-band signaling audio tones formerly used to control long-distance telephone exchanges.
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Cal Ripken Jr.
Calvin Edwin Ripken Jr. (born August 24, 1960), nicknamed "The Iron Man", is an American former baseball shortstop and third baseman who played 21 seasons in Major League Baseball (MLB) for the Baltimore Orioles (1981–2001).
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Carmichael number
In number theory, a Carmichael number is a composite number n which satisfies the modular arithmetic congruence relation: for all integers b which are relatively prime to n. They are named for Robert Carmichael.
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Centered cube number
A centered cube number is a centered figurate number that counts the number of points in a three-dimensional pattern formed by a point surrounded by concentric cubical layers of points, with i 2 points on the square faces of the i-th layer.
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Centered heptagonal number
A centered heptagonal number is a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers.
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Centered octagonal number
A centered octagonal number is a centered figurate number that represents an octagon with a dot in the center and all other dots surrounding the center dot in successive octagonal layers.
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Centered pentagonal number
A centered pentagonal number is a centered figurate number that represents a pentagon with a dot in the center and all other dots surrounding the center in successive pentagonal layers.
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Centered square number
In elementary number theory, a centered square number is a centered figurate number that gives the number of dots in a square with a dot in the center and all other dots surrounding the center dot in successive square layers.
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Chess rating system
A chess rating system is a system used in chess to calculate an estimate of the strength of the player, based on his or her performance versus other players.
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Colossally abundant number
In mathematics, a colossally abundant number (sometimes abbreviated as CA) is a natural number that, in a particular, rigorous sense, has many divisors.
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Cousin prime
In mathematics, cousin primes are prime numbers that differ by four.
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Cuban prime
A cuban prime (from the role cubes (third powers) play in the equations) is a prime number that is a solution to one of two different specific equations involving third powers of x and y. The first of these equations is: and the first few cuban primes from this equation are: 7, 19, 37, 61, 127, 271, 331, 397, 547, 631, 919, 1657, 1801, 1951, 2269, 2437, 2791, 3169, 3571, 4219, 4447, 5167, 5419, 6211, 7057, 7351, 8269, 9241,...
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Cube
In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex.
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Decagonal number
A decagonal number is a figurate number that extends the concept of triangular and square numbers to the decagon (a ten-sided polygon).
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Decimal
The decimal numeral system (also called base-ten positional numeral system, and occasionally called denary) is the standard system for denoting integer and non-integer numbers.
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Democratic Party presidential candidates, 2016
This article contains lists of candidates associated with the 2016 Democratic Party presidential primaries for the 2016 United States presidential election.
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Denmark
Denmark (Danmark), officially the Kingdom of Denmark,Kongeriget Danmark,.
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Eight queens puzzle
The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard so that no two queens threaten each other.
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Erdős–Nicolas number
In number theory, an Erdős–Nicolas number is a number that is not perfect, but that equals one of the partial sums of its divisors.
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Euler's totient function
In number theory, Euler's totient function counts the positive integers up to a given integer that are relatively prime to.
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Factorial
In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, The value of 0! is 1, according to the convention for an empty product.
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Fibonacci number
In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence, and characterized by the fact that every number after the first two is the sum of the two preceding ones: Often, especially in modern usage, the sequence is extended by one more initial term: By definition, the first two numbers in the Fibonacci sequence are either 1 and 1, or 0 and 1, depending on the chosen starting point of the sequence, and each subsequent number is the sum of the previous two.
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Frederiksberg
Frederiksberg is a part of the Capital Region of Denmark.
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Generalizations of Fibonacci numbers
In mathematics, the Fibonacci numbers form a sequence defined recursively by: That is, after two starting values, each number is the sum of the two preceding numbers.
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Generalized Riemann hypothesis
The Riemann hypothesis is one of the most important conjectures in mathematics.
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Happy number
A happy number is defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits in base-ten, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle that does not include 1.
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Harmonic divisor number
In mathematics, a harmonic divisor number, or Ore number (named after Øystein Ore who defined it in 1948), is a positive integer whose divisors have a harmonic mean that is an integer.
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Harry Potter and the Chamber of Secrets
Harry Potter and the Chamber of Secrets is a fantasy novel written by British author J. K. Rowling and the second novel in the Harry Potter series.
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Harry Potter and the Philosopher's Stone
Harry Potter and the Philosopher's Stone is a fantasy novel written by British author J. K. Rowling.
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Harry Potter and the Prisoner of Azkaban
Harry Potter and the Prisoner of Azkaban is a fantasy novel written by British author J. K. Rowling and the third in the Harry Potter series.
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Harshad number
In recreational mathematics, 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.
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Hertz
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
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Highly cototient number
In number theory, a branch of mathematics, a highly cototient number is a positive integer k which is above 1 and has more solutions to the equation than any other integer below k and above 1.
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Hikaru Sulu
Hikaru Kato Sulu is a fictional character in the Star Trek media franchise.
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Kaprekar number
In mathematics, a non-negative integer is called a "Kaprekar number" for a given base if the representation of its square in that base can be split into two parts that add up to the original number, with the proviso that the part formed from the low-order digits of the square must be non-zero—although it is allowed to include leading zeroes.
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Keith number
In recreational mathematics, a Keith number or repfigit number (short for repetitive Fibonacci-like digit) is a number in the following integer sequence: Keith numbers were introduced by Mike Keith in 1987.
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Leyland number
In number theory, a Leyland number is a number of the form where x and y are integers greater than 1.
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List of Unilever brands
This is a list of brands owned by Anglo-Dutch multinational company Unilever.
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Long-distance calling
In telecommunications, a long-distance call or trunk call is a telephone call made to a location outside a defined local calling area.
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Lucas number
The Lucas numbers or Lucas series are an integer sequence named after the mathematician François Édouard Anatole Lucas (1842–91), who studied both that sequence and the closely related Fibonacci numbers.
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Lucas–Carmichael number
In mathematics, a Lucas–Carmichael number is a positive composite integer n such that.
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Magic constant
The magic constant or magic sum of a magic square is the sum of numbers in any row, column, or diagonal of the magic square.
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Magic square
In recreational mathematics and combinatorial design, a magic square is a n\times n square grid (where is the number of cells on each side) filled with distinct positive integers in the range 1,2,...,n^2 such that each cell contains a different integer and the sum of the integers in each row, column and diagonal is equal.
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Markov number
A Markov number or Markoff number is a positive integer x, y or z that is part of a solution to the Markov Diophantine equation studied by.
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Mersenne prime
In mathematics, a Mersenne prime is a prime number that is one less than a power of two.
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Mertens function
In number theory, the Mertens function is defined for all positive integers n as where μ(k) is the Möbius function.
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Mian–Chowla sequence
In mathematics, the Mian–Chowla sequence is an integer sequence defined recursively in the following way.
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Motzkin number
In mathematics, a Motzkin number for a given number is the number of different ways of drawing non-intersecting chords between points on a circle (not necessarily touching every point by a chord).
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Natural number
In mathematics, the natural numbers are those 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").
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Nonagonal number
A nonagonal number is a figurate number that extends the concept of triangular and square numbers to the nonagon (a nine-sided polygon).
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Octahedral number
In number theory, an octahedral number is a figurate number that represents the number of spheres in an octahedron formed from close-packed spheres.
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Padovan sequence
The Padovan sequence is the sequence of integers P(n) defined by the initial values and the recurrence relation The first few values of P(n) are The Padovan sequence is named after Richard Padovan who attributed its discovery to Dutch architect Hans van der Laan in his 1994 essay Dom.
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Palindromic number
A palindromic number or numeral palindrome is a number that remains the same when its digits are reversed.
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Pell number
In mathematics, the Pell numbers are an infinite sequence of integers, known since ancient times, that comprise the denominators of the closest rational approximations to the square root of 2.
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Pentagonal pyramidal number
A pentagonal pyramidal number is a figurate number that represents the number of objects in a pyramid with a pentagonal base.
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Perfect totient number
In number theory, a perfect totient number is an integer that is equal to the sum of its iterated totients.
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Power of two
In mathematics, a power of two is a number of the form where is an integer, i.e. the result of exponentiation with number two as the base and integer as the exponent.
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Primorial
In mathematics, and more particularly in number theory, primorial is a function from natural numbers to natural numbers similar to the factorial function, but rather than successively multiplying positive integers, only prime numbers are multiplied.
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Primorial prime
In mathematics, primorial primes are prime numbers of the form pn# ± 1, where pn# is the primorial of pn (the product of the first n primes).
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Product (mathematics)
In mathematics, a product is the result of multiplying, or an expression that identifies factors to be multiplied.
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Pronic number
A pronic number is a number which is the product of two consecutive integers, that is, a number of the form.
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Proth number
In number theory, a Proth number, named after the mathematician François Proth, is a number of the form where k is an odd positive integer and n is a positive integer such that 2^n > k. Without the latter condition, all odd integers greater than 1 would be Proth numbers.
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Ramanujan's ternary quadratic form
In mathematics, in number theory, Ramanujan's ternary quadratic form is the algebraic expression with integral values for x, y and z.
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Repdigit
In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal).
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Repunit
In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1 — a more specific type of repdigit.
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Roman numerals
The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages.
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Ruth–Aaron pair
In mathematics, a Ruth–Aaron pair consists of two consecutive integers (e.g., 714 and 715) for which the sums of the prime factors of each integer are equal: and There are different variations in the definition, depending on how many times to count primes that appear multiple times in a factorization.
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Safe prime
A safe prime is a prime number of the form 2p + 1, where p is also a prime.
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SAT
The SAT is a standardized test widely used for college admissions in the United States.
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Sexy prime
In mathematics, sexy primes are prime numbers that differ from each other by six.
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Smarandache–Wellin number
In mathematics, a Smarandache–Wellin number is an integer that in a given base is the concatenation of the first n prime numbers written in that base.
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Smith number
A Smith number is a composite number for which, in a given base (in base 10 by default), the sum of its digits is equal to the sum of the digits in its prime factorization.
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Sophie Germain prime
In number theory, a prime number p is a Sophie Germain prime if 2p + 1 is also prime.
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Sphenic number
In number theory, a sphenic number (from σφήνα, 'wedge') is a positive integer that is the product of three distinct prime numbers.
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Square pyramidal number
In mathematics, a pyramid number, or square pyramidal number, is a figurate number that represents the number of stacked spheres in a pyramid with a square base.
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Star number
A star number is a centered figurate number that represents a centered hexagram (six-pointed star), such as the one that Chinese checkers is played on.
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Star Trek
Star Trek is an American media franchise based on the science fiction television series created by Gene Roddenberry.
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Super-Poulet number
A super-Poulet number is a Poulet number, or pseudoprime to base 2, whose every divisor d divides For example, 341 is a super-Poulet number: it has positive divisors and we have: When a composite number is a pseudoprime to base 2, but not to every base (That is, not a Carmichael number), then it is a super-Poulet number, and when \frac is not prime, then it and every divisor of it are a pseudoprime to base 2, and a super-Poulet number.
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Super-prime
Super-prime numbers (also known as higher-order primes or prime-indexed primes) are the subsequence of prime numbers that occupy prime-numbered positions within the sequence of all prime numbers.
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Superior highly composite number
In mathematics, a superior highly composite number is a natural number which has more divisors than any other number scaled relative to some positive power of the number itself.
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Sydney
Sydney is the state capital of New South Wales and the most populous city in Australia and Oceania.
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Tetrahedral number
A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron.
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Triangular number
A triangular number or triangle number counts objects arranged in an equilateral triangle, as in the diagram on the right.
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Twin prime
A twin prime is a prime number that is either 2 less or 2 more than another prime number—for example, either member of the twin prime pair (41, 43).
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United States Chess Federation
The United States Chess Federation (also known as US Chess or USCF) is the governing body for chess competition in the United States and represents the U.S. in FIDE, the World Chess Federation.
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Vampire number
In mathematics, a vampire number (or true vampire number) is a composite natural number v, with an even number of digits n, that can be factored into two integers x and y each with n/2 digits and not both with trailing zeroes, where v contains precisely all the digits from x and from y, in any order, counting multiplicity.
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Video game console
A video game console is an electronic, digital or computer device that outputs a video signal or visual image to display a video game that one or more people can play.
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Wagstaff prime
In number theory, a Wagstaff prime is a prime number p of the form where q is an odd prime.
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Wedderburn–Etherington number
The Wedderburn–Etherington numbers are an integer sequence named for Ivor Malcolm Haddon Etherington.
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Windows 2000
Windows 2000 (codenamed NT 5.0) is an operating system for use on both client and server computers.
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Woodall number
In number theory, a Woodall number (Wn) is any natural number of the form for some natural number n. The first few Woodall numbers are.
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1
1 (one, also called unit, unity, and (multiplicative) identity) is a number, numeral, and glyph.
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2112 (album)
2112 (pronounced "twenty-one twelve") is the fourth studio album by Canadian rock band Rush, released on April 1, 1976 by Anthem Records.
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2520 (number)
2520 (two thousand five hundred twenty) is the natural number following 2519 and preceding 2521.
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2600: The Hacker Quarterly
2600: The Hacker Quarterly is an American seasonal publication of technical information and articles, many of which are written and submitted by the readership, on a variety of subjects including hacking, telephone switching systems, Internet protocols and services, as well as general news concerning the computer "underground".
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360 (number)
360 (three hundred and sixty) or three sixty is the natural number following 359 and preceding 361.
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420 (number)
420 (four hundred twenty) is the natural number following 419 and preceding 421.
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60 (number)
60 (sixty) is the natural number following 59 and preceding 61.
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References
[1] https://en.wikipedia.org/wiki/2000_(number)
