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What is the maximum value of the $4 times 4$ determinant composed of 1-16?

Mathematics Asked on December 27, 2021

If 1-9 is filled in the $3 times 3$ determinant, and each number appears once,then the maximum value of the determinant is $412$.

For example, the following determinant can take the maximum value of $412$:
$$left|
begin{array}{ccc}
1 & 4 & 8 \
7 & 2 & 6 \
5 & 9 & 3 \
end{array}
right|=412.$$

Question: if 1-16 is filled in the $4times4$ determinant, and each number appears once, what is the maximum value of the determinant? Is it necessarily less than $16 times 15 times 14 times 13= 43680$?

One Answer

The largest known value is $$left| begin{array}{cccc} 12 & 13 & 6 &2 \ 3 & 8 & 16 &7\ 14 & 1 & 9 &10 \ 5 & 11 &4 &15 end{array} right|=40800.$$

See this paper and the OEIS sequence A085000 as a reference.

Answered by Robert Z on December 27, 2021

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