There are 26 distinct 3x3 magic squares at the center of the 174,240 order 5 concentric magic squares. In Frénicle standard form they are:
This table shows the number of occurrences of each 3x3 sub-square:
Order5Special makes the order 5 concentric magic squares.
The 26 3x3 squares also appear inlaid at the corner of some order 5 magic squares; and, 20 of them appear inlaid at the side of some order 5 magic squares. Examples:
This table shows the number of occurrences of each 3x3 square at a corner of an order 5 magic square:
This table shows the number of occurrences of each 3x3 square at a side of an order 5 magic square:
Order5Special makes the order 5 magic squares with inlaid corner and side 3x3 squares.