A141328 Infinite array read by antidiagonals: a(m,n) = the smallest positive integer that is > max(m,n) and is non-coprime to both m and n.

4, 6, 6, 6, 6, 6, 10, 6, 6, 10, 8, 15, 6, 15, 8, 14, 9, 10, 10, 9, 14, 10, 21, 8, 10, 8, 21, 10, 12, 12, 14, 10, 10, 14, 12, 12, 12, 12, 10, 35, 8, 35, 10, 12, 12, 22, 12, 12, 10, 14, 14, 10, 12, 12, 22, 14, 33, 12, 15, 10, 14, 10, 15, 12, 33, 14, 26, 15, 22, 15, 12, 14, 14, 12, 15