311271domain: NAppears in sequencesNumbers k that divide the sum of the first k composite numbers.at n=15A053781Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 0 3 5 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 0 3 5 6 or 7.at n=29A252251