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HTML

              
                  <!DOCTYPE html>
  <html>
  <title>perfectnumbers_2a</title>
  <body>

  <h2>JavaScript for perfect numbers</h2>

  <p id="demo"></p>
   <script src="perfectnumbers_c.js"></script>
  </body>
  </html>
              
            
!

CSS

              
                
              
            
!

JS

              
                const lijst = [];
let p=0;let q =0;//2 delen vh perfecte getal
const lijstPriem = 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for (let i=0; i<1000; i++){
  if (lijstPriem.includes(2**i-1)){
    p = 2**(i-1);
    q = (2**i-1)
    lijst.push(p*q);
  }
  document.getElementById("demo").innerHTML = lijst ;
}

              
            
!
999px

Console