Euler is not Haunting!

ϕ(n)=n1\large{\phi(n) =n-1}

Find the number of positive integers n<20n< 20 satisfying the equation above.


Notation: ϕ()\phi(\cdot) denotes the Euler's totient function.


Inspired from Kuhal Bose.
×

Problem Loading...

Note Loading...

Set Loading...