五,用直步魔和方阵
(编者:广义全等和拉丁方)
合成完美幻方
(施学良2001,2,6来稿)
以n=9为例:先用直步法构造两个9阶正交魔和方阵,见图a, A(I,J)和图b, B(I,J)
1,同组数数序之设计,是将同组n个数分成p=3个组,使第1,4,7序号,第2,5,8序号,第3,6,9序号位置上的各数之和均相等。编组方法可有1, 6, 8; 2, 4, 9; 3, 5, 7, 和1,5,9; 2, 6, 7; 3,4,8两种。图a之数序属第一种,图b属第二种(各数减1)。见第一组。 2,组间相同的数走马步:方阵A(I,J)走(2,1)马步(即右2,下1),方阵B(I,J)走马步(4,1)。即可构造正交魔和方阵图a ,图b。 3,按H(I,J)=n×A(I,J)+B(I,J)构造完美幻方H(I,J)。 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
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1 |
11 |
21 |
42 |
49 |
32 |
80 |
63 |
70 |
|
36 |
79 |
55 |
65 |
3 |
15 |
22 |
41 |
53 |
|
14 |
26 |
45 |
52 |
28 |
74 |
57 |
69 |
4 |
|
78 |
58 |
68 |
8 |
18 |
25 |
37 |
47 |
30 |
|
20 |
39 |
51 |
31 |
77 |
62 |
72 |
7 |
10 |
|
61 |
64 |
2 |
12 |
24 |
40 |
50 |
35 |
81 |
|
44 |
54 |
34 |
73 |
56 |
66 |
6 |
13 |
23 |
|
67 |
5 |
17 |
27 |
43 |
46 |
29 |
75 |
60 |
|
48 |
33 |
76 |
59 |
71 |
9 |
16 |
19 |
38 |