Numere prime

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Mateescu Constantin
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Numere prime

Post by Mateescu Constantin »

Sa se determine numerele prime pozitive \( a,\ b,\ c,\ d \) pentru care expresia \( \frac{1}{a}+\frac{1}{b}+\frac{1}{c}+\frac{1}{d}-\frac{1}{abcd} \) este un numar intreg.

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Marius Mainea
Gauss
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Post by Marius Mainea »

Se poate enunta problema si cu a,b,c,d naturale :wink:
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