Mathematics – Number Theory
Scientific paper
2010-08-11
Mathematics
Number Theory
Fixed typo in second paragraph; fixed typo in numerical value for c on the bottom of p.8; added reference [12] (cited after st
Scientific paper
Let $r \ge 2$ be an integer and let $A$ be a finite, nonempty set of nonzero integers. We will obtain a lower bound for the number of squarefree integers $n$, up to $x$, for which the products $\prod_{p \mid n} (p+a)$ (over primes $p$) are perfect $r$th powers for all $a \in A$. Also, in the cases $A = \{-1\}$ and $A = \{+1\}$, we will obtain a lower bound for the number of such $n$ with exactly $r$ distinct prime factors.
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