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1. CJM 2007 (vol 59 pp. 127)

Lamzouri, Youness
Smooth Values of the Iterates of the Euler Phi-Function
Let $\phi(n)$ be the Euler phi-function, define $\phi_0(n) = n$ and $\phi_{k+1}(n)=\phi(\phi_{k}(n))$ for all $k\geq 0$. We will determine an asymptotic formula for the set of integers $n$ less than $x$ for which $\phi_k(n)$ is $y$-smooth, conditionally on a weak form of the Elliott--Halberstam conjecture.

Categories:11N37, 11B37, 34K05, 45J05

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