158287domain: NAppears in sequencesPositive integers n such that 13^n == 4 (mod n).at n=5A116630Number of (7+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=25A258560