380005949domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of 3Xn arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 3Xn array.at n=18A219804Prime numbersat n=20325662