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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. [40] 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. 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.

  5. Totient summatory function - Wikipedia

    en.wikipedia.org/wiki/Totient_summatory_function

    The summatory of reciprocal totient function is defined as ():= = ()Edmund Landau showed in 1900 that this function has the asymptotic behavior (+ ⁡) + + (⁡)where γ is the Euler–Mascheroni constant,

  6. Leonhard Euler - Wikipedia

    en.wikipedia.org/wiki/Leonhard_Euler

    Euler's work averages 800 pages a year from 1725 to 1783. ... Euler invented the totient function φ(n), ... he agreed to view the proof as it was presented in court ...

  7. Primitive element (finite field) - Wikipedia

    en.wikipedia.org/wiki/Primitive_element_(finite...

    The number of primitive elements in a finite field GF(q) is φ(q − 1), where φ is Euler's totient function, which counts the number of elements less than or equal to m that are coprime to m. This can be proved by using the theorem that the multiplicative group of a finite field GF( q ) is cyclic of order q − 1 , and the fact that a finite ...

  8. Reduced residue system - Wikipedia

    en.wikipedia.org/wiki/Reduced_residue_system

    Here φ denotes Euler's totient function. ... {1, 5, 7, 11}. The cardinality of this set can be calculated with the totient function: φ(12) = 4. Some other reduced ...

  9. Carmichael's totient function conjecture - Wikipedia

    en.wikipedia.org/wiki/Carmichael's_totient...

    In mathematics, Carmichael's totient function conjecture concerns the multiplicity of values of Euler's totient function φ(n), which counts the number of integers less than and coprime to n. It states that, for every n there is at least one other integer m ≠ n such that φ ( m ) = φ ( n ).