M math951 Jul 2015 617 16 United States Oct 17, 2019 #1 https://imgur.com/a/oSU6rJ6 Specifically, (3/n), when doing the triangle inequality.

romsek MHF Helper Nov 2013 6,748 3,037 California Oct 17, 2019 #2 for positive integers $\dfrac{1}{N^3} \leq \dfrac 1 N$ then they added $\dfrac 1 N + \dfrac 2 N$