549100

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 78.at n=18A031756
• Number of orthogonal rectangles with vertices on an n X n square grid of points but with no vertices on the grid's diagonals.at n=41A285956
• a(n) is the smallest integer k > n such that sqrt(1/n - 1/k) is a rational number; or 0 if no such k exists.at n=18A379816