90062519domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of zero-sum nX3 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.at n=6A201798Number of zero-sum nX7 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.at n=2A201802Prime numbersat n=5220401