How to prove$\forall n\ge5 $
$$\phi(n)\ge \frac{n}{6\log \log (n)} $$
$\phi$ is Euler function
Thanks in advance
2026-03-30 00:21:13.1774830073
how prove $\phi(n)\ge \frac{n}{6\log \log (n)} $ $\forall n\ge5 $
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