April update of www.multimagie.com/indexengl.htm, including details of some news previously announced through [math-fun]: - multiplicative cubes (thanks again to Edwin Clark for his checkings) - first known 6x6 bimagic square, by Jaroslaw Wroblewski - smallest possible pandiagonal Sudoku - and some other news But you will see that it remains a lot of open questions! As for example the very difficult factorization problem in 3 dimensions, asked for multiplicative cubes. Best regards. Christian.