GRYSZKA, K. The identity 7^(3n)+7^(3n+1)=(2∙7^n )^3 and its generalizations. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia, [S. l.], v. 15, p. 5–13, 2023. DOI: 10.24917/20809751.15.1. Disponível em: https://didacticammath.uken.krakow.pl/article/view/10436. Acesso em: 21 nov. 2024.