Editing Magic square (section)

===Magic constant===
{{main|Magic constant}}
The constant that is the sum of any row, or column, or diagonal is called the [[magic constant]] or magic sum, ''M.'' Every normal magic square has a constant dependent on the order {{mvar|n}}, calculated by the formula <math>M = n(n^2 + 1)/2</math>. This can be demonstrated by noting that the sum of <math>1,2,...,n^2</math> is <math>n^2(n^2 + 1)/2</math>. Since the sum of each row is <math>M</math>, the sum of <math>n</math> rows is <math>n M = n^2(n^2 + 1)/2</math>, which when divided by the order {{mvar|n}} yields the magic constant as <math>M = n(n^2 + 1)/2</math>. For normal magic squares of orders ''n'' = 3, 4, 5, 6, 7, and 8, the magic constants are, respectively: 15, 34, 65, 111, 175, and 260 (sequence [[OEIS:A006003|A006003]] in the [[On-Line Encyclopedia of Integer Sequences|OEIS]]).