80311

Appears in sequences

• Denominators of the convergents of the continued fraction for sqrt{1 - 1/sqrt{2}}, the abscissa of the point of bisection of the arc of the unit lemniscate (x^2 + y^2)^2 = x^2 - y^2 in the first quadrant.at n=13A154742
• a(n) = 5^n+3^n-1.at n=7A155603
• Numbers k such that k+1 is a divisor of 3^k + 5^k.at n=8A234536
• a(n) = floor(sqrt(F(n+2)^2 + F(n)^2)), where F(n) = A000045(n).at n=23A245271
• G.f. A(x) satisfies: A(x) = 1 + x + x^2 * A(x/(1 - 5*x)) / (1 - 5*x).at n=8A351056