If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.
function myFunction() {
const reducer = (number, total) => number + total;
var a = [];
for (i = 0; i < 1000; i++)
if (i % 3 == 0 || i % 5 == 0) {
a.push(i);
}
document.getElementById("answer").innerHTML = a.reduce(reducer);
}