38055domain: NAppears in sequencesNumbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 13.at n=16A031691a(n) = 169*n^2 + 2*n.at n=14A158220Number of (n+1) X (1+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0011 or 0111.at n=10A259243