Question: Prove that for any integer n>1, the integer (10n1)/9 is not a perfect square. Problem 2: For any integer $a>0$, show that 7a3+5a is divisible

Prove that for any integer n>1, the integer (10n1)/9 is not

Prove that for any integer n>1, the integer (10n1)/9 is not a perfect square. Problem 2: For any integer $a>0$, show that 7a3+5a is divisible by 6

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