m2.4

def check_prime(n,i):

    if(i==1):

        return True;

    else:

        if(n%i==0):

            return False

        else:

            return check_prime(n,i-1)

print("1: to check a no. is prime \n Else: Generate primes \n")

op=int(input())

if(op==1):

    i = int(input("Enter An Integer:"))

    if(check_prime(i,int(i/2))):

        print(str(i)+" is a prime no.")

    else:

         print(str(i)+" is not a prime no.")

else:

    for i in range(5, 501):

        result = check_prime(i,int(i/2))

        if(result==True):

            print(i)