How many solutions does a) , b) where is prime and can be written as ( ), c) where is prime and can be written as ( ).

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- Oct 3rd 2009, 06:58 AM #1

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- Oct 4th 2009, 07:04 AM #2

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I hope this link will help you Congruence x^2 ? -1 mod p (Euler), and a super-Wilson theorem. - a knol by Wlodzimierz Holsztynski