On the largest prime factor of $x^2-1$

Abstract

In this paper, we find all integers $x$ such that $x^2-1$ has only prime factors smaller than 100. This gives some interesting numerical corollaries. For example, for any positive integer $n$ we can find the largest positive integer $x$ such that all prime factors of each of $x,x+1,...,x+n$ are less than 100.

arXiv comment10 pages, to appear in Math. Comp