Concept information
Preferred term
noncototient number
Definition
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In number theory, a noncototient is a positive integer n that cannot be expressed as the difference between a positive integer m and the number of coprime integers below it. That is, m − φ(m) = n, where φ stands for Euler's totient function, has no solution for m. The cototient of n is defined as n − φ(n), so a noncototient is a number that is never a cototient.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Noncototient)
Broader concept
In other languages
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French
URI
http://data.loterre.fr/ark:/67375/PSR-DP8K2263-S
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