freeCodeCamp/curriculum/challenges/en/08-coding-interview-prep/project-euler/problem-7-10001st-prime.en.md

id, challengeType, title

id	challengeType	title
5900f3731000cf542c50fe86	5	Problem 7: 10001st prime

Description

By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the nth prime number?

Instructions

Tests

- text: <code>nthPrime(6)</code> should return 13.
  testString: 'assert.strictEqual(nthPrime(6), 13, ''<code>nthPrime(6)</code> should return 13.'');'
- text: <code>nthPrime(10)</code> should return 29.
  testString: 'assert.strictEqual(nthPrime(10), 29, ''<code>nthPrime(10)</code> should return 29.'');'
- text: <code>nthPrime(100)</code> should return 541.
  testString: 'assert.strictEqual(nthPrime(100), 541, ''<code>nthPrime(100)</code> should return 541.'');'
- text: <code>nthPrime(1000)</code> should return 7919.
  testString: 'assert.strictEqual(nthPrime(1000), 7919, ''<code>nthPrime(1000)</code> should return 7919.'');'
- text: <code>nthPrime(10001)</code> should return 104743.
  testString: 'assert.strictEqual(nthPrime(10001), 104743, ''<code>nthPrime(10001)</code> should return 104743.'');'

Challenge Seed

function nthPrime(n) {
  // Good luck!
  return true;
}

nthPrime(10001);

Solution

const nthPrime = (number)=>{
 let pN = 2;
 let step = 0;
 while (step<number) {
   let isPrime = true;
   for(let i = 2;i<pN;i++){
      if(!(pN%i)){
        isPrime = false;
        break;
      }
   }
   isPrime ? step++ : '';
    pN++;
 }
 return pN-1;
}