\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{Definitions and preliminaries}{}% 2
\BOOKMARK [1][-]{section.3}{Congruences modulo 9}{}% 3
\BOOKMARK [1][-]{section.4}{Congruences modulo 24 and 25}{}% 4
\BOOKMARK [1][-]{section.5}{Acknowledgments}{}% 5