Problem 1172. Wheat on a chessboard pt 1

Created by Robert Turner
Appears in Matrix Patterns II

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If a chessboard were to have wheat placed upon each square such that one grain were placed on the first square and each successive square after had double the amount of grains as the square before. How many grains of wheat would be on the chessboard at the finish?

Assume the chess board is n by n squares.

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Last Solution submitted on Apr 27, 2025

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Prateep Mukherjee on 8 Jan 2013

actually you need to use isequalwithequalnans

Jan Orwat on 11 Apr 2014

tests 5 and 6 does not work properly. those numbers are out of precision, and for test 6 it couldn't be fixed even with uint64 used instead of type double

Massimo Zanetti on 19 Oct 2016

This problem is simply wrong. The right answer is

sum(1:2^(n^2-1))

if we where to sum ALL the grains on the board....

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Matrix Patterns II

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