230432domain: NAppears in sequencesNumbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 30.at n=31A031708a(n) = 225*n^2 + n.at n=31A156814a(n) = 900*n^2 + 2*n.at n=15A158406a(n) = 32*(32*n^2 + 1).at n=15A158685