${\displaystyle {}n}$

${\displaystyle {}0}$

${\displaystyle {}1}$

${\displaystyle {}2}$

${\displaystyle {}3}$

${\displaystyle {}4}$

${\displaystyle {}5}$

${\displaystyle {}6}$

${\displaystyle {}7}$

${\displaystyle {}8}$

${\displaystyle {}9}$

${\displaystyle {}10}$

${\displaystyle {}11}$

${\displaystyle {}f(n)}$

${\displaystyle {}0}$

${\displaystyle {}1}$

${\displaystyle {}3}$

${\displaystyle {}8}$

${\displaystyle {}18}$

${\displaystyle {}38}$

${\displaystyle {}88}$

${\displaystyle {}188}$

${\displaystyle {}388}$

${\displaystyle {}888}$

${\displaystyle {}1388}$

${\displaystyle {}1888}$

Für alle weiteren ${\displaystyle {}n}$ muss man ${\displaystyle {}500}$ dazuaddieren.

${\displaystyle {}f(1000000)=1388+999990\cdot 500=1388+499995000=499996388\,.}$