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totative __NOTOC__ In number theory, a totative of a given positive integer is an integer such that and is coprime to . 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''. The distribution of totatives has been a subject of study. Paul Erdős conjectured that, writing the totatives of ''n'' as : the mean square gap satisfies : for some constant ''C'' and this was proved by Bob Vaughan and Hugh Montgomery. ==See also==
*Reduced residue system
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