One century ago, Henry E. Dudeney studied the first magic squares of primes even if, at that time, "1" was considered as a prime number, and was used in his squares. Look for example at http://mathworld.wolfram.com/PrimeMagicSquare.html Hot news: this week, the first BIMAGIC square of primes has been constructed (and not using "1"!). And its order is also prime: 11. Reminder. A bimagic square of order n is a nxn magic square remaining magic after each of its n² numbers have been squared. It is the first solved problem on the 10 open problems published in my Math Intelligencer article, Spring 2005. But it means also that 9 problems are still unsolved. A lot of work remains to be done, including "small" unsolved problems: - 3x3 magic square of squares (only semi-magic are known) - 4x4 magic square of cubes (only semi-magic are known) - 5x5 bimagic square (only semi-bimagic are known) Christian.