Define $(\ell,k)$-smough numbers to be numbers that have prime divisors $p$ of form either $p|\ell!$ or $k<p$. 1. Given an $\ell$ is there a maximum $k$ above which there is no $n$ such that $q(n(n+1))$ is $(\ell,k)$-smough where $q(x)=x(x^2-1)$? 2. Is there a fast algorithm to find $n$ for a given $\ell,k$ such that $q(n(n+1))$ is $(\ell,k)$-smough when such $n$ exists or return $n=\infty$? ---------------- Interesting cases at $n<100$ are at $17,31,59,89,97$: https://www.wolframalpha.com/input/?i=Factor%28%28p%29%28p%2B1%29%28%28%28p%29%28p%2B1%29%29%5E2-1%29%29+at+p%3D17 https://www.wolframalpha.com/input/?i=Factor%28%28p%29%28p%2B1%29%28%28%28p%29%28p%2B1%29%29%5E2-1%29%29+at+p%3D31 https://www.wolframalpha.com/input/?i=Factor%28%28p%29%28p%2B1%29%28%28%28p%29%28p%2B1%29%29%5E2-1%29%29+at+p%3D59 https://www.wolframalpha.com/input/?i=Factor%28%28p%29%28p%2B1%29%28%28%28p%29%28p%2B1%29%29%5E2-1%29%29+at+p%3D89 https://www.wolframalpha.com/input/?i=Factor%28%28p%29%28p%2B1%29%28%28%28p%29%28p%2B1%29%29%5E2-1%29%29+at+p%3D97 I doubt $k$ grows much if $\ell$ is fixed.