647549275812domain: NAppears in sequencesImaginary part of (5+12i)^n.at n=11A067358Values of x such that x^2 + y^2 = 13^n with x and y coprime and 0 < x < y.at n=22A188948Even numbers x such that x^2 + y^2 = 13^n with x and y coprime.at n=22A188982