Necessary condition
If the number 2n - 1 is prime then the exponent n has to be a prime number .
Question 2
www.matheprisma.uni-wuppertal.deNotwendige Bedingung
Eine Zahl der Form 2n - 1 kann nur dann eine Primzahl sein, wenn n eine Primzahl ist.
Frage 2
www.matheprisma.uni-wuppertal.deAn underground water reservoir for Abu Dhabi
Three men with helmets around a water pump
Abu Dhabi has few options at its disposal for storing drinking water.
www.giz.deTrinkwasserspeicher für Abu Dhabi
Drei Männer mit Bauhelmen an einer Wasserpumpe
Abu Dhabi verfügt über wenige Möglichkeiten Trinkwasser zu speichern.
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