If `1 leq k leq 25`, how many prime numbers are there which are of the form `6k + 1?`

How many prime numbers are there between 1 and 100?

How many prime number are there between 1 and 50 ?

A=k^(2)-1andB=(k+1)^(2)-1 , where k is a natural number greater than 1. How many prime number are there by which both A and B are divisible for at least one value of k?

List the prime numbers from 25 to 100. How many are they?

Show that any prime number can be expressed in the form of 6k+-1(k in N) for number greater than 3.

Show that there are an infinite number of primes of the form 4k + 1 and of the form 4k+ 3.