2020979domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of n X n X n triangular nonnegative integer arrays with all sums of an element and its neighbors <= 5.at n=5A166177Number of 5X5X5 triangular nonnegative integer arrays with all sums of an element and its neighbors <= n.at n=5A166191Prime numbersat n=150398