title: Algorithm function for fibonacci series
body: <p>I'm not looking necessarily for an answer, but I am looking for what this question is asking of.  Found this question studying for an interview but not sure what they're asking?</p>
  
  <blockquote>
    <p>Write function that runs through the Fibonacci sequence and returns
    the index that is passed in as a parameter.</p>
  </blockquote>