467583domain: NAppears in sequencesNumbers k such that prime(k) == -1 (mod sigma(k)).at n=27A067696Number 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, -1, 0), (-1, 0, -1), (1, -1, 0), (1, 1, 1)}.at n=11A149504