130656229domain: NAppears in sequencesReal part of (1 + 2*i)^n, where i is sqrt(-1).at n=27A006495Column 0 of triangle A118435.at n=27A118436Values of x such that x^2 + y^2 = 5^n with x and y coprime and 0 < x < y.at n=26A230710