Find nth prime number in java

In this post, we will see how to find nth Prime number in java.

What is prime number

Prime number is a number that is greater than 1 and divided by 1 or itself.
For example: 5, 7, 13, 23

We have already seen how to check if number is prime or not. We will use same method to find nth prime number in java.

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Nth prime number in java

Here are steps to find nth prime number in java.

  • Take value of n from user using Scanner class.
  • Intialize a variable count. It will keep track of number of prime number processed so far.
  • Intialize a variable i. It will keep track of current number.
  • Iterate over while loop until count ! = n
    • Increment i by 2 as even numbers are not prime
    • Check if number is prime. If number is prime then increment count by 1.
  • Return i which is nth prime number.

Output:

Enter the value of n
24
Nth Prime Number is: 89

That’s all about how to find nth prime number in java.


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