JavaScript Question of the Day April 1, 2025

Consider the following program:

function main() {
    for (let i = 1; i <= 10; i++) {
        if (mystery(i)) {
            console.log(i);
        }
    }
}

function mystery(num) {
    if (num <= 1) {
        return false;
    }
    if (num <= 3) {
        return true;
    }
    if (num % 2 == 0 || num % 3 == 0) {
        return false;
    }
    for (let i = 5; i * i <= num; i = i + 6) {
        if (num % i == 0 || num % (i + 2) == 0) {
            return false;
        }
    }
    return true;
}

main();

What will be printed in the console?

1. Correct Answer
   Incorrect Answer
   a

   1
   2
   3
   5

2. Correct Answer
   Incorrect Answer
   b

   2
   3
   5
   7

3. Correct Answer
   Incorrect Answer
   c

   10
   9
   8
   7

4. Correct Answer
   Incorrect Answer
   d

   4
   6
   8
   10