title: How to know if a binary number divides by 3?
body: <p>I want to know is there any divisible rule in binary system for dividing by 3.</p>
  
  <p>For example: in decimal, if the digits sum is divided by 3 then the number is devided by 3. For exmaple: <code>15 -&gt; 1+5 = 6 -&gt; 6</code> is divided by 3 so 15 is divided by 3.</p>
  
  <p>The important thing to understand is that im not looking for a CODE that will do so.. bool flag = (i%3==0); is'nt the answer I'm looking for. I look for somthing which is easy for human to do just as the decimal law.</p>