### Concentric 11x11 magic square

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.

Take the 9x9 concentric magic square, add 22 to all numbers and construct the border [see webpage 9x9 in 11x11 (1)]

 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

Take the 9x9 concentric magic square, add 20 to all numbers and construct the border [see webpage ultra 9x9 in 11x11 (1)]

See how the concentric magic square on this website is growing bigger and bigger:

11x11, concentric.xls