[рони]

Untropee,

<script>
function fn(x)
  {
    return 1 + Math.log(x)*Math.log(x)/2|0
  }


 function foo(y)
 {
    return Math.ceil(Math.exp(Math.sqrt((y - 1)*2)))
 }

for (var i=1; i<=100; i++)  {document.write("n = "+i+" x = "+foo(i)+ " test = "+ (fn(foo(i)) == i && fn(foo(i)-1) != i) + "<br>")}
</script>