\BOOKMARK [1][-]{section.1}{Introduction and notation}{}% 1
\BOOKMARK [1][-]{section.2}{A generalization of the gcd-sum function}{}% 2
\BOOKMARK [1][-]{section.3}{Main properties of the function gk}{}% 3
\BOOKMARK [1][-]{section.4}{Proof of Theorem 1}{}% 4
\BOOKMARK [1][-]{section.5}{Sums of reciprocals of the gcd}{}% 5
\BOOKMARK [1][-]{section.6}{The lcm-sum function}{}% 6
\BOOKMARK [1][-]{section.7}{Sum of reciprocals of the lcm}{}% 7
\BOOKMARK [1][-]{section.8}{Acknowledgment}{}% 8