Forgot password? New user? Sign up

Existing user? Log in

$\begin{cases} f(mn) & = & f(m)f(n) \\ f(m) & < & f(n) & \text{if} \ \ m<n \\ f(2)& = & 2 \end{cases}$

Suppose $f: \mathbb {N \rightarrow N}$ is a function satisfying the conditions above. Find the value of $\displaystyle \sum_{k=1}^{20} f(k)$.

Problem Loading...

Note Loading...

Set Loading...