Consecutive Integers with Same Euler Phi Value/Examples/255

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:
 * $\map \phi {255} = \map \phi {256} = 128$

Proof
From :
 * $\map \phi {255} = 128$

From :
 * $\map \phi {256} = 128$

Hence the result.