twittersplitter.js

let hua = [];

for (let i = 1; i < 10; i ++) {
  let num = 0;
  for (let j = 0; j < i; j++) {
    num += ((9 * (Math.pow(10, j))) * (140 - (j + i + 3)))
  }
  hua.push(num);
}

console.log(hua);