174169domain: NPropertiesPrimalityPrimeyesAppears in sequencesSum_{1<=k<n} gcd(k!,n!/k!).at n=15A014454Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum 2 and no antidiagonal sum 2 and no row sum 0 and no column sum 0.at n=8A255787Prime numbersat n=15851