Euler Phi Function of 91
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Example of Euler $\phi$ Function of Non-Square Semiprime
- $\map \phi {91} = 72$
where $\phi$ denotes the Euler $\phi$ Function.
Proof
We have that:
- $91 = 7 \times 13$
Thus:
\(\ds \map \phi {91}\) | \(=\) | \(\ds \paren {7 - 1} \paren {13 - 1}\) | Euler $\phi$ Function of Non-Square Semiprime | |||||||||||
\(\ds \) | \(=\) | \(\ds 6 \times 12\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds 72\) |
$\blacksquare$