1064447283

Appears in sequences

• a(n) = 5^n*cos(2*n*arctan(1/2)) or denominator of tan(2*n*arctan(1/2)).at n=13A066771
• Largest leg in right triangle with relatively prime sides and hypotenuse 5^n.at n=12A067312
• Numerator of imaginary part of (3*i - 1)^(-n).at n=26A124871
• Real part of (2 + i)^n, where i = sqrt(-1).at n=26A139011
• Imaginary part of (4 + 3i)^n.at n=12A139031
• Values of y such that x^2 + y^2 = 5^n with x and y coprime and 0 < x < y.at n=25A230711