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  2. Divisor function - Wikipedia

    en.wikipedia.org/wiki/Divisor_function

    For a non-square integer, n, every divisor, d, of n is paired with divisor n/d of n and () is even; for a square integer, one divisor (namely ) is not paired with a distinct divisor and () is odd. Similarly, the number σ 1 ( n ) {\displaystyle \sigma _{1}(n)} is odd if and only if n is a square or twice a square.

  3. Arithmetic function - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_function

    A classical example of this phenomenon [9] is given by the divisor summatory function, the summation function of d(n), the number of divisors of n: = ⁡ ⁡ ⁡ ⁡ = ⁡ + + + ⁡ + ⁡ + + ⁡ = An average order of an arithmetic function is some simpler or better-understood function which has the same summation function asymptotically, and ...

  4. Möbius inversion formula - Wikipedia

    en.wikipedia.org/wiki/Möbius_inversion_formula

    A simple example of the use of this formula is counting the number of reduced fractions 0 < ⁠ a / b ⁠ < 1, where a and b are coprime and b ≤ n. If we let f(n) be this number, then g(n) is the total number of fractions 0 < ⁠ a / b ⁠ < 1 with b ≤ n, where a and b are not necessarily coprime.

  5. Ramanujan's sum - Wikipedia

    en.wikipedia.org/wiki/Ramanujan's_sum

    σ k (n) is the divisor function (i.e. the sum of the k-th powers of the divisors of n, including 1 and n). σ 0 (n), the number of divisors of n, is usually written d(n) and σ 1 (n), the sum of the divisors of n, is usually written σ(n). If s > 0,

  6. Table of divisors - Wikipedia

    en.wikipedia.org/wiki/Table_of_divisors

    In the SVG file, hover over a bar to see its statistics. The tables below list all of the divisors of the numbers 1 to 1000. A divisor of an integer n is an integer m, for which n/m is again an integer (which is necessarily also a divisor of n). For example, 3 is a divisor of 21, since 21/7 = 3 (and therefore 7 is also a divisor of 21).

  7. Superior highly composite number - Wikipedia

    en.wikipedia.org/wiki/Superior_highly_composite...

    Divisor function d(n) up to n = 250 Prime-power factors. In number theory, a superior highly composite number is a natural number which, in a particular rigorous sense, has many divisors. Particularly, it is defined by a ratio between the number of divisors an integer has and that integer raised to some positive power.

  8. Multiple choice - Wikipedia

    en.wikipedia.org/wiki/Multiple_choice

    A multiple choice question, with days of the week as potential answers. Multiple choice (MC), [1] objective response or MCQ(for multiple choice question) is a form of an objective assessment in which respondents are asked to select only the correct answer from the choices offered as a list.

  9. Highest averages method - Wikipedia

    en.wikipedia.org/wiki/Highest_averages_method

    The two names for these methods—highest averages and divisors—reflect two different ways of thinking about them, and their two independent inventions. However, both procedures are equivalent and give the same answer. [1] Divisor methods are based on rounding rules, defined using a signpost sequence post(k), where k ≤ post(k) ≤ k+1.