SUMICAD, Rulthan P. On the Picture-Perfect Number. Journal of Mathematics and Statistics Studies, [S. l.], v. 4, n. 4, p. 106–111, 2023. DOI: 10.32996/jmss.2023.4.4.11. Disponível em: https://alkindipublisher.com/index.php/jmss/article/view/6435. Acesso em: 22 sep. 2026.