arXiv · 2012.11539
The aim of this paper is to prove wordlessly the sum formula of $1^{k}+2^{k}+\ldots +n^{k}$, $k\in\{1,2,3\}$.
Bikash Chakraborty. 2020-12-21. Proof Without Words: Sums of Powers of Natural numbers. https://doi.org/10.1007/s00283-017-9727-9
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