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Old 2020-10-21, 18:25   #2
Viliam Furik
 
"Viliam Furík"
Jul 2018
Martin, Slovakia

17A16 Posts
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The whole process is here.

If we say the 7 factorial is x, then we can generalize it for x, and by shifting things around, we find that expression of the form (√√x + √√x) * √(√x + (√x)/x) is a whole number whenever x+1 is a square.
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