Nontotient
- 非欧拉商数（非欧拉商数是数论中不在欧拉函数值域内的整数，即不存在一个整数x，恰好有n个小于x且与x互质的整数。除了1，其他奇数都是非欧拉商数）
Nontotient
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abstract:
In number theory, a nontotient is a positive integer n which is not a totient number: it is not in the range of Euler's totient function φ, that is, the equation φ(x) = n has no solution x. In other words, n is a nontotient if there is no integer x that has exactly n coprimes below it.
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WordNet