325600domain: NAppears in sequencesBeginning of a run of 4 consecutive Niven (or Harshad) numbers.at n=36A141769Number of (n+2) X (3+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=12A252187