527525domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 2, 5, 6, 7 and 8.at n=52A137111Number 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, 0), (-1, 1, -1), (1, -1, 0), (1, 0, 1)}.at n=14A148122