Euler Phi Function of 526

Example of Use of Euler $\phi$ Function

$\map \phi {526} = 262$

where $\phi$ denotes the Euler $\phi$ Function.

Proof

We have that:

$526 = 2 \times 263$

Thus:

\(\ds \map \phi {526}\)

\(=\)

\(\ds 263 - 1\)

Euler Phi Function of 2 times Odd Prime

\(\ds \)

\(=\)

\(\ds 262\)

$\blacksquare$