title: Generate a sequence of numbers with repeated intervals
body: <p>I am trying to create sequences of number of 6 cases, but with 144 cases intervals. </p>
  
  <p>Like this one for example </p>
  
  <pre><code>c(1:6, 144:149, 288:293)
  
  1   2   3   4   5   6 144 145 146 147 148 149 288 289 290 291 292 293
  </code></pre>
  
  <p>How could I generate automatically such a sequence with </p>
  
  <pre><code>seq 
  </code></pre>
  
  <p>or with another function ? </p>