729216domain: NAppears in sequencesSum of aliquot divisors of Ramanujan's highly composite numbers.at n=31A072824Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=20A252526