With initial observations, I would like to ask the following question:
Are there infinitely many primes of the form $2^{2^n}-1$ $(n\in \mathbb{N})$?
With initial observations, I would like to ask the following question:
Are there infinitely many primes of the form $2^{2^n}-1$ $(n\in \mathbb{N})$?
Hint: $2^{2^n}-1=(2^{2^{n-1}}-1)(2^{2^{n-1}}+1)$