Smallest Common Multiple do not count

JavaScript
1

Tell us what’s happening:
Can anybody tell, why this code is not working. It works fine for [1, 12]. But then just stops working. What is wrong?

Your code so far


function smallestCommons(arr) {
  var b = 1;
for (var k = Math.min(arr[0], arr[1]); k<=Math.max(arr[0], arr[1]); k++) {b = b*k;
console.log(b);} 
  loop1:
for (var i = Math.max(arr[0], arr[1])+1; i<b; i++) { loop2:
    for (var j = Math.min(arr[0], arr[1]); j<=Math.max(arr[0], arr[1])+1; j++) {
if (j == Math.max(arr[0], arr[1])+1) 
{console.log(i);
return i;}
  else if (i % j == 0) {continue loop2;}
     else {continue loop1;}
    }
  }
  return i;
}

smallestCommons([1, 13]);

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Link to the challenge: