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sub e {
$N=pop;$a[$_]=int(1+1/$_)for 1..$N;for(;$N>9;print int$x)
{for($n=$N--;--$n;$a[$n]=$x%$n,$x=10*$a[$n-1]+$x/$n){}}
}
e(1000);

Congratulations. You've made it to level 2. Go to www.xxxxx.org and en
+ter xxxxxxxxxxx as the login and the answer to this equation as the p
+assword. 

...
f(4)= xxxxxxxxxx 
f(5)= __________

Congratulations. 

...

One thing we learned while building Google is that it's easier to find
+ what you're looking for if it comes looking for you. What we're look
+ing for are the best engineers in the world. And here you are. 
[snip]