Modular arithmetic

Totative

In number theory, a totative of a given positive integer n is an integer k such that 0 < k ≤ n and k is coprime to n. Euler's totient function φ(n) counts the number of totatives of n. The totatives under multiplication modulo n form the multiplicative group of integers modulo n. (Wikipedia).

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Related pages

Reduced residue system | Euler's totient function | Multiplicative group of integers modulo n | Paul Erdős | Number theory