The proper name for 'relatively prime numbers' is 'coprime numbers', so you can change the title if you want ;)

This kata is not about primes but about "relatively prime". Where do you read anything about 1 considered a prime in this kata? Description only talks about factors and divisors.

One cannot be called a prime number, since a prime has 2 divisors, and one is 1. The number 1 is not classified as either simple or composite
Here 1 is considered a prime number

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Python new test framework

First, there is a typo in the desription. "All numbers in will be positive integers.". I guess the word "arr" is missing in there.
Second, the description create unnecessary confusion. At the beginning a range of numbers are compared to each other. But afterwards a list of number shall only be compared to one number (=n).

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C Translation (author inactive).

Also, examples show "17 17". It is not clear what this is intended to convey.

The input is 0 [-1]. Actual and expected are not shown; this could be achieved by replacing == by ===. Random tests do not actually guarantee "All numbers in will be positive integers", just that they are non-zero, but generated zeroes will be shown as input.