19323713domain: NAppears in sequencesa(n) = n * Pell(n).at n=17A093967Positive numbers y such that y^2 is of the form x^2+(x+17)^2 with integer x.at n=25A155923a(n) = 6*a(n-1)-a(n-2) for n > 2; a(1) = 17, a(2) = 85.at n=8A156157