# More fun in 2015, Part 35

**Number Theory**Level 5

Find the smallest square-free positive integer \(n\) such that there exist more than 2015 Pythagorean triangles with hypotenuse \(n\). (As we all know, a Pythagorean triangle is a right triangle with positive integer sides.) As your answer, enter the largest prime factor of \(n\).

**Bonus Question**: How would Alexander Grothendieck have answered this question?