title: CSS nth-child formula to select every 7th element and the 5th element
body: <p>So I'm creating a hexagon pattern with CSS3, and I'd like it to look like this;</p>
  
  <p><a href="http://www.upperfirst.com" rel="noreferrer">http://www.upperfirst.com</a></p>
  
  <p>I'm having my hexagons float:left in a body of a certain width. I can effectively accomplish the results in the link above if I can select the first element in every other row. What would be the nth-child formula for that?</p>
  
  <p>It would be the 5th element, then every 7th element after that?</p>