Program to Find Prime Numbers in a Given Range in Python

Finding Prime Numbers in a Range

A prime number is a natural number greater than 1 that has no divisors other than 1 and itself.

We will explore different methods to find all prime numbers within a given range using Python programming.

Method 1: Using a for Loop

We iterate through the given range and check if each number is prime.

def is_prime(num):
    if num < 2:
        return False
    for i in range(2, int(num ** 0.5) + 1):
        if num % i == 0:
            return False
    return True

start = int(input("Enter the start of the range: "))
end = int(input("Enter the end of the range: "))

print(f"Prime numbers between {start} and {end} are:", end=" ")
for num in range(start, end + 1):
    if is_prime(num):
        print(num, end=" ")
            

Output:

Enter the start of the range: 10
Enter the end of the range: 20
Prime numbers between 10 and 20 are: 11 13 17 19