wheat and chessboard problem

English

By the time that the fifth square is reached on the chessboard, the board contains a total of 31 grains of wheat.

Proper noun

wheat and chessboard problem

1. (mathematics) A mathematical problem where one must determine how many grains of wheat are on a chessboard, assuming one grain of wheat is placed on the first square, and each subsequent square having twice as many grains of wheat as the previous square.

   Synonym: rice and chessboard problem