interesting.log.iteration.js

function z(n) {
    const T = 0.00001
    let lastT = 0; let L = Math.log(n);
    while(Math.abs(lastT-L) > T) { lastT = L;
        L = Math.log(n)/Math.log(L);
    }
    return L;
}

this is sort of the natural base of any number