At this site:
The Invention of Chess
Z21.1 [ATU 2009] Origin of chess. Inventor asks one wheat-grain for first square, two for the second, four for the third, eight for the fourth, etc. The king cannot pay.
additional information:
Murray History of Chess (Oxford 1913) 207-9, 755 [
online at Internet Archive]
see also Wikipedia:
Wheat and Chessboard Problem
Powers of Two / The Chess Number
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