Primitive Points on a Modular Hyperbola
Tom 54 / 2006
                    
                    
                        Bulletin Polish Acad. Sci. Math. 54 (2006), 193-200                    
                                        
                        MSC: 11A07, 11K38, 11L40.                    
                                        
                        DOI: 10.4064/ba54-3-1                    
                                    
                                                Streszczenie
For positive integers $m$, $U$ and $V$, we obtain an asymptotic formula for the number of integer points $(u,v) \in [1, U]\times [1,V]$ which belong to the modular hyperbola $uv \equiv 1 \pmod m$ and also have $\gcd(u, v) =1$, which are also known as primitive points. Such points have a nice geometric interpretation as points on the modular hyperbola which are “visible” from the origin.
 
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            