let regForLoop = async (n) => {
  let max = Math.pow(n, n);
  let sum = 0
  let tens = 1
  for (let i = 0; i < max; i++) {
    sum += i
    if (Math.log10(i) > tens) {
      console.log(i);
      tens++;
    }
  }
  return sum;
}

let promiseForLoop = (n) => new Promise((resolve, reject) => {
  try {
    setTimeout(() => resolve(regForLoop(n)), 0 );
  } catch (e) {
    reject(console.log(e))
  }
})