Block-Structured Prime Magic Squares: Orders 24, 25 and 26

This work bring different ways of representing prime magic squares. These are of type: blocks, block-bordered, concentric, nested, etc. This work is for the orders 24, 25 and 26. For prime magic squares of orders 6 to 23 author's work given in reference list. In case of prime magic squares of order 26, there is only example, i.e., four equal sum concentric primes magic squaers of order 13. The other examples are based on magic square of order 24. In this case, we constructed block-bordered prime magic squares, with internal blocks based on different types of prime magic squares of order 24. This work is also available at author's web-site.