SOLUTION: There is a legend that the inventor of chess chose the follwing as his reward. One grain of wheat on the first square, two grains on the second square, four on the third, eight on

Question 247860: There is a legend that the inventor of chess chose the follwing as his reward. One grain of wheat on the first square, two grains on the second square, four on the third, eight on the fourth, and so on for all sixty-four squares on the chess board. Find an expression for the amount of wheat required to fulfill his request.
So I know:a=1
r=2
tn=64
Have I done something wrong? I don't understand how this one works.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The sum is 2^64-1
-----------------
=~ 1.84467E19
You can get all the digits using the calculator on Windows.
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