Vrijeme: 08:27

Imam 99 problema, no koliko rješenja? | I got 99 problems, but what about solutions? #2

Ako za \forall n \in \mathbb{N}, funkcija f(n) predstavlja broj parova prirodnih rješenja sustava (ne)jednadžbi:

\begin{align*} 
x + y &= n \\
nx + y &\leq n \lceil \sqrt{n} \rceil
\end{align*}

odredi zbroj \sum_{n=2}^{2022} f(n).

Let f(n) be the number of pairs of natural numbers that satisfy the system: \begin{align*} 
x + y &= n \\
nx + y &\leq n \lceil \sqrt{n} \rceil
\end{align*} Determine \sum_{n=2}^{2022} f(n).