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close #19118 

#### Brief description of what is fixed or changed

give `primerange` a single-arg option and document the use of `prime` to reference by index the desired number of primes to generate
```python
>>> primerange(prime(10))  # up to 10th
[2, 3, 5, 7, 11, 13, 17, 19, 23]
>>> primerange(prime(10)+1)  # including the 10th
[2, 3, 5, 7, 11, 13, 17, 19, 23, 29]
```
#### Other comments


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* ntheory
  * `primerange` now accepts a single argument, a,  which gives the range [2, a)
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