Number theory

[SAMEER CHAUDHARI]

Sir, please help me with this questions.

1) Find the gcd of 21^5 −1 and 21^8 −1.

2) Find the prime(s) p such that 17p+1 is a square.

[Saumik Karfa]

Problem 2 is already discussed in StackExchange  . We do not wish to rewrite the same thing. Here is the direct link : https://math.stackexchange.com/questions/688014/find-all-perfect-squares-of-the-form-17p-1-where-p-is-a-prime ,  that contains the discussion

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