3332064domain: NAppears in sequencesNumbers n such that n | sigma(n) - d(n) + phi(n).at n=4A056013Number 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=17A252187