and thanks to Edwin Clark, USA, for his checkings of all
my multiplicative magic cubes!
First known 6x6 bimagic
square using distinct
integers, by Jaroslaw Wroblewski, Poland. See also
the updated
table. An important and long-awaited result: first known example of
a bimagic square smaller
than the 8x8!
First known pandiagonal bimagic square
using consecutive integers, by Su Maoting, China.
A lot of people (including me...) thought that this problem was perhaps
impossible.
A lot of first known bimagic squares, orders:
13, by Chen Qinwu-Chen Mutian,
China, and ... independently, only 3 days
later... by Jacques Guéron, France