A great math olympiad problem l find the possible vales of n=? l very easy solution.

A great math olympiad problem l find the possible vales of n=? l very easy solution.
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[OmarOng]

What's the title of the background music? TIA.

[prollysine]

let u=(5/2)^x, u^2-10u+1=0, u=(10+V96)/2, u= 5+V24, (5-V24), x= log(5+V24)/log(5/2), log(5-V24)/log(5/2),
x=~ 2.50186, -2.50186, test, OK,