Arrange the positive integers according to the rule shown in the figure. If the ordinal number pair (m, n) is used to represent the m-th row from top to bottom and the n-th number from left to right, for example, (4, 2) is used to represent the integer 8. Then (63, 56) is used to represent the number______ ．

Arrange the positive integers according to the rule shown in the figure. If the ordinal number pair (m, n) is used to represent the m-th row from top to bottom and the n-th number from left to right, for example, (4, 2) is used to represent the integer 8. Then (63, 56) is used to represent the number______ ．

If the ordinal number pair (m, n) is used to represent the m-th row from top to bottom, the n-th number from left to right, and the ordinal number pair and (4, 2) as shown in the figure are used to represent the integer 8, then, (4, 2) = (4 − 1) × 42 + & nbsp; 2 = 8; (3, 1) = (3 − 1) × 32 + 1 = 4; (4, 4) = (4 − 1) × 42 + 4 = 10 It can be found that for all pairs of numbers (m, n) (n ≤ m), there are: (m, n) = (1 + 2 + 3 +...) +So, (63, 56) = (63 − 1) × 632 + 56 = 1953 + 56 = 2009

The number of a column is arranged according to the following rules: √ 2,2, √ 6,2 √ 2, √ 10 (1) The sixth number is (), the eighth number is (); (2) what's the nth number? Please use the formula containing n

The sixth 2 √ 3
The eighth four
The nth √ 2n