Richard Guy wrote: If he, or anyone else, pursues the B & C reference, please let me know. +++ Richard, as I said, I have the paper. But nothing on the discussed properties. Send me a private message if you want a scan of that paper.
Christoph Pacher wrote: I dropped also a note about the relation to the 3x3 magic square. Christan, if this ok for you, I would/should give credit to you for that... +++ Sure, no problem. And proud! But mention that a similar property (deleting digits) was previously found by R. Holmes in the other formulas.
Paul Muljadi wrote: The Lo Shu is more "magical" than most of us have known for thousands of years! +++ Again on: 6 1 8 7 5 3 2 9 4 Do you know this other one: 6*1*8 + 7*5*3 + 2*9*4 = 6*7*2 + 1*5*9 + 8*3*4 And still another one: If the above magic square is considered as a matrix M, then M*M*M is still a magic square
1101 1077 1197 1221 1125 1029 1053 1173 1149 (magic sum = 3375) In fact, any M^(2k+1) yield a magic square. (and M^2k are semi-magic squares) Christian.