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- Newsgroups: sci.math
- Path: sparky!uunet!mcsun!sunic!dkuug!daimi!tusk
- From: tusk@daimi.aau.dk (Martin M|ller Pedersen)
- Subject: Re: Magic Squares Orden 4 solved
- Message-ID: <1992Oct16.000659.7573@daimi.aau.dk>
- Sender: tusk@daimi.aau.dk (Martin M|ller Pedersen)
- Organization: DAIMI: Computer Science Department, Aarhus University, Denmark
- References: <1992Oct15.073515.21172@daimi.aau.dk>
- Date: Fri, 16 Oct 92 00:06:59 GMT
- Lines: 21
-
- A little about Magic Squares.
-
- A standard magic square is a square array of positive integers from 1 through N^2, arranged
- so that the sum of every row, every column, and each of the two main diagonals is the same.
- N is the "order" of the square. It is easy to see that the magic constant isthe sum of all the
- numbers divided by N. The formulua is (1+2+3+4+...+N^2)/N = .5*(N^3+N)
-
- The trivial square of order 1 is simply the number 1, and of course it is unique. It is
- equally trivial to prove that no order-2 square is possible.
- There is eight ways to arrange the digits 1 through 9 in an order-3 array that is magic.
- It is traditional, however, not to count rotations and reflections. When they are excluded, the
- order-3 square i unique.
-
- There are 880 magic squares ( excuding rotations and reflections ) of order 4. They were first
- given by Bernard Frencle de Bessy in 1693.
-
- There are 275.305.224 magic square of order 5.
-
- Order 6 ???
-
-
-