One colour: $S_m(1,\ell) = \min(\ell-1, \lfloor m/\ell \rfloor)$ for $2 \le \ell \le m$

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One colour: $S_m(1,\ell) = \min(\ell-1, \lfloor m/\ell \rfloor)$ for $2 \le \ell \le m$ · Prove2Me