Print all Prime Numbers in an Interval

A positive integer greater than 1 which has no other factors except 1 and the number itself is called a prime number. 2, 3, 5, 7 etc. are prime numbers as they do not have any other factors. But 6 is not prime (it is composite) since, 2 x 3 = 6. We ask the user for a range and display all the primes in that interval.

Source Code

# Python program to ask the user for a range and display all the prime numbers in that interval

# take input from the user
lower = int(input("Enter lower range: "))
upper = int(input("Enter upper range: "))

for num in range(lower,upper + 1):
   # prime numbers are greater than 1
   if num > 1:
       for i in range(2,num):
           if (num % i) == 0:
               break
       else:
           print(num)

Output

Enter lower range: 900
Enter upper range: 1000
907
911
919
929
937
941
947
953
967
971
977
983
991
997

Here, we take an interval from the user and find prime numbers in that range. Visit this page to understand the code to check for prime numbers.