ES2015 Prime Number Generator Function

function *primeGenerator() {
  let knownPrimes = [2]
  const isPrime = (num) => knownPrimes.find(p => num % p === 0) === undefined
  let n = 2
  while (true) {
    if (isPrime(n)) {
      knownPrimes.push(n)
      yield n
    }
    n++
  }
}

const primes = primeGenerator()
console.time("Time Taken ")
for(let i = 0; i<2000; i++) console.log(`#${i+1} --> ${primes.next().value}`);
console.log("--------------------");
console.timeEnd("Time Taken ")