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Find square out of the sum of factorials!

Number Theory Level 3

If \(A\) is a positive integer, how many values of \(n\) satisfy \(1! + 2! + \cdots + n! = A^2\)?

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Excel in math and science

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It's hard to learn from lectures and videos

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including olympiad champions, researchers, and professionals.

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by Anurag Pandey

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