What's equal this:${\frac 12 ^ \frac 13} ^{\cdots \frac1n}$?

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I want to know wht's equal this number :${\frac 12 ^ \frac 13} ^{\cdots \frac1n}$, however it's seems trivial that is converge to 1 , but i don't know how i can evaluate it , Really i have two question: the first is : what is the partial sum of it ? and what's equal for n large enough or go to infty ?