1557945

Appears in sequences

• Denominators of continued fraction convergents to sqrt(424).at n=17A041807
• One half of the even entries of A033317.at n=63A261250
• Take the solution to Pellian equation x^2 - 8*n*y^2 = 1 with smallest positive y and x >= 0; sequence gives a(n) = y, or 0 if n is twice a positive square. A368340 gives values of x.at n=52A368339