260 (number)
260 is the magic constant of nxn magic square and n-Queens Problem for n = 8, the size of an actual chess board.
260 is also the magic constant of the Franklin magic square devised by Benjamin Franklin.
52 61 4 13 20 29 36 45
14 3 62 51 46 35 30 19
53 60 5 12 21 28 37 44
11 6 59 54 43 38 27 22
55 58 7 10 23 26 39 42
9 8 57 56 41 40 25 24
50 63 2 15 18 31 34 47
16 1 64 49 48 33 32 17
The minor diagonal gives 260, an in addition a number of combinations of two half diagonals of four numbers from a corner to the center give 260.
Given a 4 by 4 chessboard, there are only 260 ways to place six non-attacking bishops.
This article discusses 260 the number. To see information about the year 260, go to 260.
