38053824domain: NAppears in sequencesa(n) = 10^(2n-1) minus largest square less than 10^(2n-1).at n=7A128826Record minima of the positive distance d between the fifteenth power of a positive integer x and the square of an integer y such that d = x^15 - y^2 (x <> k^2 and y <> k^15).at n=6A179812