184471domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 87 ones.at n=18A031855Super-5 Numbers (5 * n^5 contains substring '55555' in its decimal expansion).at n=34A032745G.f. satisfies: A(x) = 1 + x*A(x)^2/A(-x).at n=11A143339