def is_prime(n: int) -> bool:
        """Check if a number is prime."""
        if n <= 1:
            return False
        if n <= 3:
            return True
        if n % 2 == 0 or n % 3 == 0:
            return False
        i = 5
        while i * i <= n:
            if n % i == 0 or n % (i + 2) == 0:
                return False
            i += 6
        return True

    def get_primes(limit: int) -> list[int]:
        """Get all prime numbers up to limit."""
        return [n for n in range(2, limit + 1) if is_prime(n)]

    # Example usage
    prime_numbers = get_primes(100)
    print(f"Prime numbers up to 100: {prime_numbers}")