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Question Number 8302 by tawakalitu last updated on 07/Oct/16

find all possible values of x and y satisfying   1! + 2! + 3! + ... + x! = y^2

$$\mathrm{find}\:\mathrm{all}\:\mathrm{possible}\:\mathrm{values}\:\mathrm{of}\:\mathrm{x}\:\mathrm{and}\:\mathrm{y}\:\mathrm{satisfying}\: \\ $$$$\mathrm{1}!\:+\:\mathrm{2}!\:+\:\mathrm{3}!\:+\:...\:+\:\mathrm{x}!\:=\:\mathrm{y}^{\mathrm{2}} \\ $$

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