Defining, exemplifying, conjecturing ... to proveif a number is a happy number. Advances of Research in Mathematics Education, [S. l.], n. 5, p. 5–24, 2014. DOI: 10.35763/aiem.v1i5.73. Disponível em: https://aiem.es/aiem/article/view/3971. Acesso em: 20 may. 2026.