Start with a 3x3 magic square and put a border around the square again and again to get a 3x3 in 5x5 in 7x7 in 9x9 in ... magic square.
2 | 9 | 4 | ||||||||||
7 | 5 | 3 | ||||||||||
6 | 1 | 8 | ||||||||||
22 | 18 | 3 | 2 | 20 | ||||||||
7 | 10 | 17 | 12 | 19 | ||||||||
5 | 15 | 13 | 11 | 21 | ||||||||
25 | 14 | 9 | 16 | 1 | ||||||||
6 | 8 | 23 | 24 | 4 | ||||||||
6 | 1 | 3 | 43 | 41 | 39 | 42 | ||||||
48 | 34 | 30 | 15 | 14 | 32 | 2 | ||||||
46 | 19 | 22 | 29 | 24 | 31 | 4 | ||||||
45 | 17 | 27 | 25 | 23 | 33 | 5 | ||||||
10 | 37 | 26 | 21 | 28 | 13 | 40 | ||||||
12 | 18 | 20 | 35 | 36 | 16 | 38 | ||||||
8 | 49 | 47 | 7 | 9 | 11 | 44 | ||||||
10 | 81 | 79 | 77 | 9 | 11 | 13 | 15 | 74 | ||||
16 | 22 | 17 | 19 | 59 | 57 | 55 | 58 | 66 | ||||
14 | 64 | 50 | 46 | 31 | 30 | 48 | 18 | 68 | ||||
12 | 62 | 35 | 38 | 45 | 40 | 47 | 20 | 70 | ||||
75 | 61 | 33 | 43 | 41 | 39 | 49 | 21 | 7 | ||||
76 | 26 | 53 | 42 | 37 | 44 | 29 | 56 | 6 | ||||
78 | 28 | 34 | 36 | 51 | 52 | 32 | 54 | 4 | ||||
80 | 24 | 65 | 63 | 23 | 25 | 27 | 60 | 2 | ||||
8 | 1 | 3 | 5 | 73 | 71 | 69 | 67 | 72 | ||||
110 | 103 | 105 | 107 | 109 | 111 | 7 | 5 | 3 | 1 | 10 | ||
2 | 30 | 101 | 99 | 97 | 29 | 31 | 33 | 35 | 94 | 120 | ||
4 | 36 | 42 | 37 | 39 | 79 | 77 | 75 | 78 | 86 | 118 | ||
6 | 34 | 84 | 70 | 66 | 51 | 50 | 68 | 38 | 88 | 116 | ||
8 | 32 | 82 | 55 | 58 | 65 | 60 | 67 | 40 | 90 | 114 | ||
9 | 95 | 81 | 53 | 63 | 61 | 59 | 69 | 41 | 27 | 113 | ||
108 | 96 | 46 | 73 | 62 | 57 | 64 | 49 | 76 | 26 | 14 | ||
106 | 98 | 48 | 54 | 56 | 71 | 72 | 52 | 74 | 24 | 16 | ||
104 | 100 | 44 | 85 | 83 | 43 | 45 | 47 | 80 | 22 | 18 | ||
102 | 28 | 21 | 23 | 25 | 93 | 91 | 89 | 87 | 92 | 20 | ||
112 | 19 | 17 | 15 | 13 | 11 | 115 | 117 | 119 | 121 | 12 | ||
14 | 24 | 22 | 20 | 18 | 16 | 159 | 160 | 162 | 164 | 166 | 168 | 12 |
169 | 134 | 127 | 129 | 131 | 133 | 135 | 31 | 29 | 27 | 25 | 34 | 1 |
167 | 26 | 54 | 125 | 123 | 121 | 53 | 55 | 57 | 59 | 118 | 144 | 3 |
165 | 28 | 60 | 66 | 61 | 63 | 103 | 101 | 99 | 102 | 110 | 142 | 5 |
163 | 30 | 58 | 108 | 94 | 90 | 75 | 74 | 92 | 62 | 112 | 140 | 7 |
161 | 32 | 56 | 106 | 79 | 82 | 89 | 84 | 91 | 64 | 114 | 138 | 9 |
13 | 33 | 119 | 105 | 77 | 87 | 85 | 83 | 93 | 65 | 51 | 137 | 157 |
15 | 132 | 120 | 70 | 97 | 86 | 81 | 88 | 73 | 100 | 50 | 38 | 155 |
17 | 130 | 122 | 72 | 78 | 80 | 95 | 96 | 76 | 98 | 48 | 40 | 153 |
19 | 128 | 124 | 68 | 109 | 107 | 67 | 69 | 71 | 104 | 46 | 42 | 151 |
21 | 126 | 52 | 45 | 47 | 49 | 117 | 115 | 113 | 111 | 116 | 44 | 149 |
23 | 136 | 43 | 41 | 39 | 37 | 35 | 139 | 141 | 143 | 145 | 36 | 147 |
158 | 146 | 148 | 150 | 152 | 154 | 11 | 10 | 8 | 6 | 4 | 2 | 156 |
Take the 11x11 concentric magic square, add 24 to all numbers and construct the border [see webpage pan 11x11 in 13x13 (1)]
See how the concentric magic square on this website is growing bigger and bigger:
3x3, 4x4, 5x5, 6x6, 7x7, 8x8, 9x9, 10x10, 11x11, 12x12, 13x13, 14x14, 15x15, 16x16, 17x1718x18, 19x19, 20x20, 21x21, 22x22, 23x23, 24x24, 25x25, 26x26, 27x27, 28x28, 29x29, 30x30, 31x31 and 32x32