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单词 Nontotient
释义

nontotient


An integer n>0 is called a nontotientMathworldPlanetmath if Nϕ(n)=0, where Nϕ is the totient valence functionMathworldPlanetmath. This is the case of any odd integer greater than 1. This is also the case of twice a prime that isn’t a Sophie Germain primeMathworldPlanetmath, one more than a prime, an oblong number that is the product of a prime and one more or less than that prime, etc.

Sloane’s OEIS lists even values in A005277 and all values together in A007617.

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更新时间:2025/5/4 6:01:12