277523domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 75 ones.at n=28A031843Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (-1, 1, -1), (1, -1, -1), (1, 0, 1)}.at n=12A148542