Number Tips Number Squares Prime Numbers Pythagoras Maths Series Special Numbers Factorals Roman Numerals

Add the numbers of any line (horizontal, vertical or diagonal) and the results are identical.
These examples show one solution, there are others.
 
3x3 (All lines total 15)

8 1 6
3 5 7
4 9 2

4x4 (all lines total 34)

 1 12  8 13
14  7 11  2
15  6 10  3
 4  9  5 16

5x5 (all lines total 65)

11 23  4 10 17
 2 14 20 21  8
25  7 13 19  1
18  5  6 12 24
 9 16 22  3 15

6x6 (all lines total 111)

11 18 13 29 36  4
16 14 12 34  5 30
15 10 17 33 28  8
20 27 22  2  9 31
25 23 21  7 32  3
24 19 26  6  1 35

7x7 (all lines total 175)

30 21 13  5 46 38 22
39 23 15 14  6 47 31
48 32 24 16  8  7 40
 1 41 33 25 17  9 49
10 43 42 34 26 18  2
19  3 44 36 35 27 11
28 12  4 45 37 29 20

8x8 (all lines total 260)

 1  9 24 40 32 48 49 57
 2 10 23 39 31 47 50 58
59 51 46 30 38 22 11  3
61 53 44 28 36 20 13  5
60 52 45 29 37 21 12  4
62 54 43 27 35 19 14  6
 7 15 18 34 26 42 55 63
 8 16 17 33 25 41 56 64