<section id="description">
Ea is an ellipse with an equation of the form x2 + 4y2 = 4a2.
Ea' is the rotated image of Ea by θ degrees counterclockwise around the origin O(0, 0) for 0° &#x3C; θ &#x3C; 90°.b is the distance to the origin of the two intersection points closest to the origin and c is the distance of the two other intersection points.
We call an ordered triplet (a, b, c) a canonical ellipsoidal triplet if a, b and c are positive integers.
For example, (209, 247, 286) is a canonical ellipsoidal triplet.
Let C(N) be the number of distinct canonical ellipsoidal triplets (a, b, c) for a ≤ N.
It can be verified that C(103) = 7, C(104) = 106 and C(106) = 11845.
Find C(1017).
</section>

function euler404() {
  // Good luck!
  return true;
}

euler404();


index

Задача 404: Крисскрассные эллипсы

Problem 404: Crisscross Ellipses

<code>euler404()</code> should return 1199215615081353.