This does not work. You have duplicated values: e.g., the 8 in the middle of the 2nd line and the end of the 5th line. In general, you need to use numbers of the form p^(2^n) in this kind of construction. Franklin T. Adams-Watters -----Original Message----- From: Michael Kleber <michael.kleber@gmail.com> This now gives us an easy way to lower the magic product and max entry in your square: your use of 9 as the base for one plane is inefficient, since a smaller prime power, 8, is still available. Taking your matrix and replacing every multiple of 9 with 8/9 of itself, you get 1 3360 4 840 24 560 6 2240 192 70 48 280 8 420 32 105 5 672 20 168 120 112 30 448 960 14 240 56 40 84 160 21 280 12 1120 3 6720 2 1680 8 840 16 210 64 35 96 140 24 56 60 224 15 1344 10 336 40 168 80 42 320 7 480 28 120 ___________________________________________________ Try the New Netscape Mail Today! Virtually Spam-Free | More Storage | Import Your Contact List http://mail.netscape.com