Question: Call a positive integer n triadic if n can be written as a sum n = x + y + z , where x <

Call a positive integer n triadic if n can be written as a sum n = x + y + z, where x < y < z, x | y, and y | z. For example, 9=1+2+6, so 9 is triadic. Find, with proof, the largest non-triadic number.
The non triadic is not 8. What else should it be or what should I do

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