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  2. Euler's totient function - Wikipedia

    en.wikipedia.org/wiki/Euler's_totient_function

    A totient number is a value of Euler's totient function: that is, an m for which there is at least one n for which φ(n) = m. The valency or multiplicity of a totient number m is the number of solutions to this equation. [41] A nontotient is a natural number which is not a totient number. Every odd integer exceeding 1 is trivially a nontotient.

  3. Euler's theorem - Wikipedia

    en.wikipedia.org/wiki/Euler's_theorem

    In 1736, Leonhard Euler published a proof of Fermat's little theorem [1] (stated by Fermat without proof), which is the restriction of Euler's theorem to the case where n is a prime number. Subsequently, Euler presented other proofs of the theorem, culminating with his paper of 1763, in which he proved a generalization to the case where n is ...

  4. Bell series - Wikipedia

    en.wikipedia.org/wiki/Bell_series

    The following is a table of the Bell series of well-known arithmetic functions. The Möbius function has () =.; The Mobius function squared has () = +.; Euler's totient has () =.; The multiplicative identity of the Dirichlet convolution has () =

  5. Glossary of number theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_number_theory

    Euler's theorem Euler's theorem states that if n and a are coprime positive integers, then a φ(n) is congruent to 1 mod n. Euler's theorem generalizes Fermat's little theorem. Euler's totient function For a positive integer n, Euler's totient function of n, denoted φ(n), is the number of integers coprime to n between 1 and n inclusive.

  6. Reduced residue system - Wikipedia

    en.wikipedia.org/wiki/Reduced_residue_system

    The cardinality of this set can be calculated with the totient function: φ(12) = 4. Some other reduced residue systems modulo 12 are: Some other reduced residue systems modulo 12 are: {13,17,19,23}

  7. Multiplicative function - Wikipedia

    en.wikipedia.org/wiki/Multiplicative_function

    In number theory, a multiplicative function is an arithmetic function f(n) of a positive integer n with the property that f(1) = 1 and = () whenever a and b are coprime.. An arithmetic function f(n) is said to be completely multiplicative (or totally multiplicative) if f(1) = 1 and f(ab) = f(a)f(b) holds for all positive integers a and b, even when they are not coprime.

  8. Totative - Wikipedia

    en.wikipedia.org/wiki/Totative

    Euler's totient function φ(n) ... The totatives under multiplication modulo n form the multiplicative group of integers modulo n. ... ISBN 978-0-387-20860-2. Zbl ...

  9. Average order of an arithmetic function - Wikipedia

    en.wikipedia.org/wiki/Average_order_of_an...

    An average order of φ(n), Euler's totient function of n, is 6n / π 2; An average order of r(n), the number of ways of expressing n as a sum of two squares, is π; The average order of representations of a natural number as a sum of three squares is 4πn / 3;

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