456401domain: NAppears in sequencesNumbers k such that k*10^10-1, k*10^10-3, k*10^10-7 and k*10^10-9 are all prime.at n=11A064981Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1), (1, 1, 1)}.at n=9A151006