Consecutive Integers with Same Euler Phi Value/Examples/1

Example of Consecutive Integers with Same Euler Phi Value
Let $\phi: \Z_{>0} \to \Z_{>0}$ denote the Euler $\phi$ function: the number of strictly positive integers less than or equal to $n$ which are prime to $n$.

Then:
 * $\phi \left({1}\right) = \phi \left({2}\right) = 1$

Proof
From Euler Phi Function of 1:
 * $\phi \left({1}\right) = 1$

From Euler Phi Function of Prime:
 * $\phi \left({2}\right) = 2 - 1 = 1$

Hence the result.