Factorial Product Is Square

Number Theory Level 3

Find the largest integer \(n \leq 200\) such that for some positive integer \(k< n\) the product \(n!k!\) is a perfect square.

Details and assumptions

The number \( n!\), read as n factorial, is equal to the product of all positive integers less than or equal to \(n\). For example, \( 7! = 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1\).

If you think that no such \(n\) exists, type your answer as 0.


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