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find all positive integer n such that 3^n-1+5^n-1 divides 3^n+5^n
This problem is discussed. We do not wish to rewrite the same thing. Please go to this link that contain the discussion : https://math.stackexchange.com/questions/2109523/find-all-possible-positive-integer-n-such-that-3n-1-5n-1-mid-3n-5