Gran Canaria, España
Well-known basic concepts about perfect, abundan! and deficient nwnbers are introduced through severa! examples that illustrate their properties ami the relationships between them. Since this is a su ject under constant research by both teachers and amateurs, new results are continual y added to repositories, where they can be con-sulted. More than a research work in itse(f,' this work is on y intend-ed to be an initiator of the curiosity (?f teachers who want to .find a topic to investigate.
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