Let one grain of wheat be placed on the first square of a Chessboard, two on the second, four on the third, eight on
the fourth, etc. How many grains total are placed on an Chessboard? Since this is a Geometric
Series, the answer for squares is
Pappas, T. ``The Wheat & Chessboard.'' The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra,
p. 17, 1989.