SEIBERT, Jaroslav; TROJOVSKÝ, Pavel. On divisibility of the numbers H_n(1), H_n(2) and H_n(3). Annales Mathematicae Silesianae, [S. l.], v. 17, p. 41–51, 2003. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14099. Acesso em: 7 may. 2025.