Is Carmichael's totient conjecture true?
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Carmichael's totient conjecture states that for every number n, there is another number m such that φ(n) = φ(m), where φ is the totient function (the number of positive integers less than n that are coprime to n). In other words, every value in the image of the totient function is the totient of at least two distinct numbers.

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