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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.
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