Need help creating a function on language: Racket

Need to return a list of all prime numbers up to integer of the input.

I.e.

primes 7

should return :

[2, 3, 5, 7]

primes 100

[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]