<section id="description">
A hexagonal orchard of order n is a triangular lattice made up of points within a regular hexagon with side n. The following is an example of a hexagonal orchard of order 5:Highlighted in green are the points which are hidden from the center by a point closer to it. It can be seen that for a hexagonal orchard of order 5, 30 points are hidden from the center.
Let H(n) be the number of points hidden from the center in a hexagonal orchard of order n.
H(5) = 30. H(10) = 138. H(1 000) = 1177848.
Find H(100 000 000).
</section>

function euler351() {
  // Good luck!
  return true;
}

euler351();


index

Задача 351: Шестиугольные сады

Problem 351: Hexagonal orchards

<code>euler351()</code> should return 11762187201804552.