257045

Appears in sequences

• Discriminant a(n) of the indefinite binary quadratic Markoff form m(n)*F_{m(n)}(x, y) with m(n) = A002559(n), for n >= 1.at n=7A305312
• a(n) is the numerator of the square of the n-th Lagrange number.at n=7A382098
• a(n) is the number of squares in the n-th ring (n >= 0) of the Poincaré diagram of the order-5 square tiling of the hyperbolic plane (Schläfli symbol {4,5}).at n=8A390190