Place 1 grain of rice on the first square of a chessboard.
Double it on every next square.
How many grains end up on the 64th square?

Question

Accepted Answer

2⁶³ grains — about 9.2 quintillion. More rice than has ever been grown. — Doubling is a quiet thief of intuition. The first 30 squares are reasonable; the next 34 conspire against the laws of agriculture.

Place 1 grain of rice on the first square of a chessboard. Double it on every next square. How many grains end up on the 64th square?