cannonball problem

The English word “cannonball problem” has 1 meaning listed here.

proper noun

The challenge of proving that the only solution of the Diophantine equation :∑ₙ₌₁ᴺn²=M²; with N > 1 is when N = 24 and M = 70.

It can be visualized as the problem of taking a square arrangement of cannonballs on the ground and building a square pyramid out of them.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.