until one

function untilOne(n) {
  if (n <= 0 || !isFinite(n)) {
    return -1;
  }

  let x = n;
  let i = 0;

  while (Math.sqrt(x) !== 1) {
    x = Math.sqrt(x);
    i++;
  }

  return i;
}

for (let i = 0; i <= 55; i++) {
  console.log(`${i} : ${untilOne(i)} `);
}