Appending odd multiples of 7 code challenge

Here is the code challenge:

"For this challenge, we'd like to know in a range of values from 1 to 100, how many numbers are both odd, and a multiple of 7.

To start us off, I've written a for loop to iterate over the desired range of values and named the local constant n. Your job is to write an if statement inside the for loop to carry out the desired checks.

If the number is both an odd number and a multiple of 7, append the value to the results array provided.

Hint: To check for an odd number use the not operator to check for "not even""

In Xcode, my code below makes the results array return [7, 21, 35, 49, 63, 77, 91]

But the code challenge does not work because I am not appending the values to the array when I click Check work. What am I doing wrong? Is there a way to see the correct answer to a code challenge so I can move on?

var results: [Int] = []

for n in 1...100 {
    // Enter your code below
    if (n % 2 == 1) && (n % 7 == 0){
    results += [n]
    // End code 
}