The output for print_first_n_primes(10) will be: 2Ģ9 Print first n prime numbers in Python using a while loop The loop continues until it has printed the required number of prime numbers. If the number is prime, it prints the number and increments a counter count.

For each number, it checks whether the number is prime using the is_prime function. This program uses a while loop to iterate over the natural numbers starting from 2. # Let's use the function to print first 10 prime numbers Here is a simple program to print the first 10 prime numbers in Python using a while loop. Print the first 10 prime numbers in Python using a while loop In the same way, you can also print prime numbers from 1 to 20 in python. These are the prime numbers less than or equal to 30. You can see the program output when I run the code. Here is how you would do it: Enter the start of range: 10 Let’s say you want to find all prime numbers in the range 10 to 30.

In this case, it prints the number because the number is a prime number.

The else associated with the for loop only runs when the loop has finished normally (i.e., it didn’t encounter a break).

If no factor is found, the else block of the inner for loop is executed.

If the number is exactly divisible (i.e., the remainder of the division is 0), then it is not a prime number and we break out of the inner for loop.

For each number, if it is greater than 1, we check for factors from 2 up to the square root of the number.

We iterate through each number in the range using a for loop.

The user inputs the start and end of the range.

If any of these divisions result in a whole number, then the number is not a prime number.Ĭomplete program: start = int(input('Enter the start of range: ')) Then we try dividing it by all numbers from 2 up to the square root of the number. Then, to find whether a number is prime, we start by assuming it is a prime number. start = int(input('Enter the start of range: '))Įnd = int(input('Enter the end of range: ')) We will start by getting the starting and ending values of the range from the user. Here is the complete program to print all prime numbers in an interval.

Python program to print prime numbers using for loopĪ prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

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