Type how many times you want to calculate the Harmonic series. Harmonic series is (1/1)+(1/2)+(1/3)+(1/4)+(1/5)... and so on. Percent done is... well the percent the computer is done calculating. You can type -1 to calculate forever.
I was in going home when I thought, "what would be 1/1 + 1/2 + 1/3... and so on," so I decided to make a scratch project about it.