ART

91 = 12 + 22 + 32 + 42 + 52 + 62

91 = 1 + 2 + 3 + ... + 12 + 13

\({\displaystyle {\begin{matrix}\mathrm {Cabtaxi} (2)&=&91&=&3^{3}+4^{3}\\&&&=&6^{3}-5^{3}\end{matrix}}} \)

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