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PowerNumberFormQuestion.txt

Being in need of calculating the following numbers with 18 decimals of precision:

$$
2^{2^{-x}}, x\in{\mathbb{N}}
$$

I looked for what built-in symbols can help me and found [Power](https://reference.wolfram.com/language/ref/Power.html) and [NumberForm](https://reference.wolfram.com/language/ref/NumberForm.html). I tried an example:

```mathematica
NumberForm[Power[2, 2^-3], 18]
```

But when evaluated, it shows up like this:

$$
2^{1/8}
$$

Whereas I wanted this:

$$
1.090507732665257659
$$

How can I make WolframCloud display the latter formatting?