Answer
$$1$$
Work Step by Step
$\lim\limits_{x \to \infty} a_n=\lim\limits_{x \to \infty} x^{1/x}\\=\lim\limits_{x \to \infty} e^{1/x \ln (x)}\\=e^{\lim\limits_{x \to \infty} [\dfrac{1}{x} \ln (x)]}\\=e^0\\=1$
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