38411domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 49 ones.at n=2A031817Denominators of continued fraction convergents to sqrt(392).at n=8A041745Denominators of u(n) where u(n) = (u(n-1) + u(n-2)) / u(n-3), with u(1) = u(2) = u(3) = 1.at n=18A185341