On the difference of consecutive numbers prime to n
Volume 8 / 1963
                    
                    
                        Acta Arithmetica 8 (1963), 343-347                    
                                        
                        DOI: 10.4064/aa-8-3-343-347                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            