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Et fuldkomment tal er defineret som et et tal, hvor summen af tallets ægte divisorer - inklusiv tallet 1 - er lig med tallet selv. Jeg troede at et tals divisorer altid er primtal (jf. primfaktoropløsning) og får derfor at faktorsummen af 28 er: 1+2+2+7=28. I min lærerbog står imidlertid at faktorsummen af 28 er: 1+2+4+7+14=28.
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