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Omni-MATH / An 8×8 array consists of the numbers 1,2,...,64. Consecutive numbers are adjacent along a row or a column. What is the minimum value of the sum of the numbers along the diagonal?

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problem

An 8×88\times8 array consists of the numbers 1,2,...,641,2,...,64. Consecutive numbers are adjacent along a row or a column. What is the minimum value of the sum of the numbers along the diagonal?
Plain-text mathematical notation (without MathML)
An 8×8 array consists of the numbers 1,2,...,64.  Consecutive numbers are adjacent along a row or a column.  What is the minimum value of the sum of the numbers along the diagonal?
Original LaTeX notation
An $8\times8$ array consists of the numbers $1,2,...,64$.  Consecutive numbers are adjacent along a row or a column.  What is the minimum value of the sum of the numbers along the diagonal?

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