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  2. Least common multiple - Wikipedia

    en.wikipedia.org/wiki/Least_common_multiple

    A multiple of a number is the product of that number and an integer. For example, 10 is a multiple of 5 because 5 × 2 = 10, so 10 is divisible by 5 and 2. Because 10 is the smallest positive integer that is divisible by both 5 and 2, it is the least common multiple of 5 and 2.

  3. Lehmer random number generator - Wikipedia

    en.wikipedia.org/wiki/Lehmer_random_number_generator

    The general formula is X k + 1 = a ⋅ X k mod m , {\displaystyle X_{k+1}=a\cdot X_{k}{\bmod {m}},} where the modulus m is a prime number or a power of a prime number , the multiplier a is an element of high multiplicative order modulo m (e.g., a primitive root modulo n ), and the seed X 0 is coprime to m .

  4. Chebyshev function - Wikipedia

    en.wikipedia.org/wiki/Chebyshev_function

    Values of lcm(1, 2, ... The following bounds are known for the Chebyshev functions: (in these formulas p k is the k th prime number; p 1 = 2, p 2 = 3, etc.)

  5. Euclidean algorithm - Wikipedia

    en.wikipedia.org/wiki/Euclidean_algorithm

    Synonyms for GCD include greatest common factor (GCF), highest common factor (HCF), highest common divisor (HCD), and greatest common measure (GCM). The greatest common divisor is often written as gcd( a , b ) or, more simply, as ( a , b ) , [ 3 ] although the latter notation is ambiguous, also used for concepts such as an ideal in the ring of ...

  6. Greatest common divisor - Wikipedia

    en.wikipedia.org/wiki/Greatest_common_divisor

    The greatest common divisor (GCD) of integers a and b, at least one of which is nonzero, is the greatest positive integer d such that d is a divisor of both a and b; that is, there are integers e and f such that a = de and b = df, and d is the largest such integer.

  7. Lowest common denominator - Wikipedia

    en.wikipedia.org/wiki/Lowest_common_denominator

    The lowest common denominator of a set of fractions is the lowest number that is a multiple of all the denominators: their lowest common multiple.The product of the denominators is always a common denominator, as in:

  8. Replica trick - Wikipedia

    en.wikipedia.org/wiki/Replica_trick

    The replica trick postulates that if can be calculated for all positive integers then this may be sufficient to allow the limiting behavior as to be calculated. Clearly, such an argument poses many mathematical questions, and the resulting formalism for performing the limit n → 0 {\displaystyle n\to 0} typically introduces many subtleties.

  9. Stars and bars (combinatorics) - Wikipedia

    en.wikipedia.org/wiki/Stars_and_bars_(combinatorics)

    The equality ((+)) = (()) can also be understood as an equivalence of different counting problems: the number of k-tuples of non-negative integers whose sum is n equals the number of (n + 1)-tuples of non-negative integers whose sum is k − 1, which follows by interchanging the roles of bars and stars in the diagrams representing configurations.