BASILAN, Armando. On Octagonal Pyramidal Number . International Journal of Education, Research, and Innovation Perspectives, Philippines, v. 2, n. 7, p. 562–566, 2026. DOI: 10.5281/zenodo.21338008. Disponível em: https://ijerip.erio.org.ph/index.php/articles/article/view/1176. Acesso em: 14 jul. 2026.