Prove that 7 ^ (n) + 6n-1 can be divisible by 36

Do you know what dimorph's theorem is? Don't talk nonsense if you don't know! Why is this high school problem related to Euler's theorem
Is there something wrong with this question
N = 1, 2 are not divisible by 36
N = 3 is OK, n = 4 is wrong

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