euler 56

let d = 0;
for (let i = 1n; i < 100n; ++i) {
    let x = 1n;
    for (let j = 1; j < 100; j++) {
        x *= i;
        d = Math.max(d, x.toString().split("").reduce((a, b) => a + parseInt(b), 0));
    }
}
console.log(d);