由 --- 於 星期四 四月 10, 2003 11:11 am
maybe there are infinite solutions
w x y z
--------------------------------------------------------
2 3 1 2
16 8 4 4
68 23 2 7
74 11 10 7
41 31 6 8
24 31 7 8
220 22 1 9
241 7 5 9
216 18 9 9
118 29 12 9
64 38 3 9
9 38 8 9
276 24 10 10
...
...