Question Number 126536 by mathocean1 last updated on 21/Dec/20
$${show}\:{by}\:{recurrence}\:{that} \\ $$$$\forall\:{integer}\:{p}\geqslant\mathrm{4},\:\left({p}+\mathrm{1}\right)^{\mathrm{3}} \leqslant\mathrm{3}{p}^{\mathrm{3}} \\ $$$$ \\ $$$$ \\ $$