Answer
11 is a Germain prime
Work Step by Step
A prime number $p$ is a Germain prime if $2p+1$ is also a prime.
This means that 11 is a Germain prime if:
$2(11)+1$ is also a prime number.
Note that $2(11)+1=23$, which is a prime number.
Thus, 11 is a Germain prime.