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Mi amigo Eulogio
Problema nº 5 de la fase regional de la XXVI Olimpiada Matemática Thales de Andalucía.
[b]Autores:[/b] Eva Barrena Algara, Raúl Manuel Falcón Ganfornina, Rosana Ramírez Campos, Ricardo Ríos Collantes de Corán.