2&40 generate one or a set of random number(s) for you.
By the way: in German you will say "two-and-fourth" for forty-two. You are able to set the number of rolls and the maximum value. You can also save your settings.
2&40 is handy for choosing your next episode to watch, just to simulate a roll (roleplaying) or to guess right the nearest number at the random number with friends.