## Problem of the Day #352: Totient Totients
*March 5, 2012*

*Posted by Alex in : potd , trackback*

Let $\tau(x) = \phi (\phi (x))$, where $\phi$ is Euler’s totient function. Find $1 \le x \le 400$ such that $\tau (x)$ is maximized.

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## Problem of the Day #352: Totient Totients
*March 5, 2012*

*Posted by Alex in : potd , trackback
*

Let $\tau(x) = \phi (\phi (x))$, where $\phi$ is Euler’s totient function. Find $1 \le x \le 400$ such that $\tau (x)$ is maximized.

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