primes.js

function* nums(n) {
  yield n;
  yield* nums(n + 1);
}

function* primes(seq) {
  const prime = seq.next().value;
  yield prime;

  const nextSeq = function* () {
    for (let num of seq) {
      if (num % prime !== 0) yield num;
    }
  };
  yield* primes(nextSeq());
}

let i = 0;
for (let n of primes(nums(2))) {
  console.log(n);
  if (++i >= 100) break;
}