async function readDigits2(url) {
const response = await fetch("https://cdat.uprh.edu/~eramos/data/datos_pi/pi-billion.txt");
const oneMillion = await response.text();
const string_limpia = oneMillion.replace(/\s+/g, '').replace('.', '');
return string_limpia.slice(1).split('').map(Number);
}