35930

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 12.at n=32A031600
• Length of hypotenuse squared in right triangle formed by a prime spiral plotted in Cartesian coordinates.at n=32A048851
• a(n) = prime(n+1)^2 + prime(n)^2.at n=31A069484
• Numbers n such that sigma(n)=2n-phi(phi(n)).at n=21A110073
• Binomial transform of [1, 2, 3, 4, 0, 0, 0, ...].at n=38A139488
• Let f map (x, y) to (x+y, x*y). Start from (X, X) and iterate f n times. Then a(n) is the coefficient of X^n in the polynomial in X that expresses the x-coordinate of the obtained position.at n=13A343952