multiplesOf3and5 Function works on all arguments except one. Also seems to be false negative

Tell us what’s happening:

multiplesOf3and5(49); // returns 543
multiplesOf3and5(19564); // returns 89301183
These are the correct values, but the editor is telling me that my function isn’t returning any correct values. I tested my code in a nodejs interpreter via a GNU/Linux terminal.

multiplesOf3and5(1000); // returns 234168

I’m being told that my function doesn’t return a correct value on ANY number.
My function seems to work on all numbers except 1000.

Why does it work on all arguments except 1000? There must be a simple mistake I am making.

Your code so far

function multiplesOf3and5(number) {
  // Good luck!
  var count = 0;var nums = [];var sum = 0;
  while (count < number) {
    count += 1;
    if (count % 3 == 0) {
    else if (count % 5 == 0){
    else {
      ; //do nothing

    for (var i of nums) { sum += i;};  return sum;


Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0.

Challenge: Problem 1: Multiples of 3 and 5

Link to the challenge:

Hint: How does having count += 1 at the beginning of your loop effect the end results?