• Thumbnail for Eulerian number
    In combinatorics, the Eulerian number A ( n , k ) {\textstyle A(n,k)} is the number of permutations of the numbers 1 to n {\textstyle n} in which exactly...
    16 KB (2,460 words) - 22:23, 2 May 2025
  • Thumbnail for Eulerian path
    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)...
    28 KB (3,296 words) - 06:19, 16 March 2025
  • node 2034 = number of unlabeled graphs on 11 nodes whose components are unicyclic graphs 2035 – Wolstenholme number 2036 – Eulerian number 2039 – Sophie...
    32 KB (4,725 words) - 17:22, 27 May 2025
  • Thumbnail for 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...
    117 KB (14,179 words) - 16:20, 4 May 2025
  • Thumbnail for Permutation
    the union of k ascending runs. The number of permutations of n with k ascents is (by definition) the Eulerian number ⟨ n k ⟩ {\displaystyle \textstyle...
    77 KB (11,671 words) - 18:58, 20 April 2025
  • Thumbnail for Fibonacci sequence
    month, the number of pairs of rabbits is equal to the number of mature pairs (that is, the number of pairs in month n – 2) plus the number of pairs alive...
    86 KB (13,066 words) - 15:37, 16 May 2025
  • 26 sporadic simple groups. Sloane, N. J. A. (ed.). "Sequence A000295 (Eulerian numbers.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation...
    5 KB (611 words) - 22:45, 20 April 2025
  • Thumbnail for Seven Bridges of Königsberg
    have even degree. All Eulerian circuits are also Eulerian paths, but not all Eulerian paths are Eulerian circuits. Euler's work was presented to the St...
    15 KB (1,789 words) - 14:05, 4 May 2025
  • Thumbnail for Composite number
    A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Accordingly it is a positive integer that has...
    6 KB (851 words) - 21:28, 27 March 2025
  • hundred [and] eighty-four) is the natural number following 183 and preceding 185. There are 184 different Eulerian graphs on eight unlabeled vertices, and...
    2 KB (220 words) - 16:04, 21 May 2025
  • Thumbnail for List of topics named after Leonhard Euler
    1/cosh t Eulerian numbers count certain types of permutations. Euler number (physics), the cavitation number in fluid dynamics. Euler number (algebraic...
    15 KB (1,721 words) - 14:18, 9 April 2025
  • Thumbnail for Natural number
    the number 1 differently than larger numbers, sometimes even not as a number at all. Euclid, for example, defined a unit first and then a number as a...
    53 KB (5,889 words) - 21:15, 27 May 2025
  • Thumbnail for Binomial coefficient
    Delannoy number Eulerian number Hypergeometric function List of factorial and binomial topics Macaulay representation of an integer Motzkin number Multiplicities...
    61 KB (10,732 words) - 15:49, 24 May 2025
  • Thumbnail for Euler diagram
    the Euler diagram shows only relevant relationships. The first use of "Eulerian circles" is commonly attributed to Swiss mathematician Leonhard Euler (1707–1783)...
    37 KB (3,634 words) - 02:03, 28 March 2025
  • OEIS Foundation. Sloane, N. J. A. (ed.). "Sequence A008517 (Second-order Eulerian triangle T(n, k), 1 <= k <= n)". The On-Line Encyclopedia of Integer Sequences...
    35 KB (5,332 words) - 08:59, 25 May 2025
  • Thumbnail for Perfect number
    In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number...
    38 KB (5,177 words) - 20:20, 10 May 2025
  • }}={\frac {120}{5040}}={\frac {1}{42}}} There are formulas connecting Eulerian numbers ⟨n m⟩ to Bernoulli numbers: ∑ m = 0 n ( − 1 ) m ⟨ n m ⟩ = 2 n +...
    93 KB (13,044 words) - 07:06, 26 May 2025
  • group Bell numbers Boustrophedon transform Eulerian number Floyd's triangle Lozanić's triangle Narayana number Pascal's triangle Rencontres numbers Romberg's...
    11 KB (634 words) - 12:01, 7 February 2025
  • Thumbnail for Wright omega function
    \rangle }\!\!{\bigg \rangle }} is a second-order Eulerian number. ω ( 0 ) = W 0 ( 1 ) ≈ 0.56714 ω ( 1 ) = 1 ω ( − 1 ± i π ) = − 1 ω...
    3 KB (589 words) - 14:46, 21 April 2025
  • mathematics, a Mersenne prime is a prime number that is one less than a power of two. That is, it is a prime number of the form Mn = 2n − 1 for some integer...
    71 KB (6,408 words) - 20:20, 22 May 2025
  • Thumbnail for Square number
    In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with...
    18 KB (2,540 words) - 19:34, 10 February 2025
  • Thumbnail for Happy number
    In number theory, a happy number is a number which eventually reaches 1 when the number is replaced by the sum of the square of each digit. For instance...
    15 KB (2,320 words) - 12:51, 28 May 2025
  • highly composite number is a positive integer that has more divisors than all smaller positive integers. If d(n) denotes the number of divisors of a positive...
    22 KB (1,712 words) - 22:03, 10 May 2025
  • discrete mathematics, the BEST theorem gives a product formula for the number of Eulerian circuits in directed (oriented) graphs. The name is an acronym of...
    5 KB (544 words) - 10:05, 7 April 2025
  • long-standing problems that resist classical analytic approaches. See also: | Eulerian number | Multiple zeta values | Operad | Partially ordered set | Srinivasa...
    111 KB (13,707 words) - 07:16, 28 May 2025
  • In mathematics, a double Mersenne number is a Mersenne number of the form M M p = 2 2 p − 1 − 1 {\displaystyle M_{M_{p}}=2^{2^{p}-1}-1} where p is prime...
    10 KB (1,021 words) - 12:40, 26 March 2025
  • Thumbnail for Triangular number
    triangular number or triangle number counts objects arranged in an equilateral triangle. Triangular numbers are a type of figurate number, other examples...
    25 KB (3,594 words) - 14:11, 26 May 2025
  • Thumbnail for Petersen graph
    integral graph—a graph whose spectrum consists entirely of integers. An Eulerian subgraph of a graph G {\displaystyle G} is a subgraph consisting of a subset...
    24 KB (2,993 words) - 04:57, 12 April 2025
  • In number theory, an n-smooth (or n-friable) number is an integer whose prime factors are all less than or equal to n. For example, a 7-smooth number is...
    12 KB (1,567 words) - 10:32, 20 May 2025
  • In 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...
    18 KB (2,776 words) - 11:20, 10 April 2025