1742387domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (4+1) X (n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.at n=7A250902Prime numbersat n=131059