It's just to remember, if it was to predict, then I would have a billion digits. Some, say its transcendental. Not sure what that it, but you have to be lucky to find a transcendental number. One mathematician was eating a sandwich (this is true), and he looked at his tomato, and he knew something as simple as a circle couldn't have a never ending nember and he worked out that in the middle of pi there would be a "1001" and it would be a palindrome (because decimals don't count.