What is the name given to two prime numbers whose difference is $2?$

How many prime numbers are there between $1$ and $30$?

Find the number of prime numbers between $50$ and $80$.

Express the following as sum of two odd prime numbers:

$28$.

$44$ can be expressed as a sum of two odd prime numbers in different ways. Write the smallest prime number among them as the final answer.

Express the following as sum of two odd prime numbers:

$60$