Question 884201
{{{(N-1)N(N+1)=4080}}}
{{{(N^2-1)N=4080}}}
{{{N^3-N-4080=0}}}
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{{{graph(300,300,-5,25,-1500,1500,x^3-x-4080)}}}
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Looks like {{{N=16}}} is a solution.
Plug it into the original equation to verify.
{{{15(16)17=4080}}}