[Solved] Convert numbers to letters beyond the 26 character alphabet

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I think you’re looking for something like this

    function colName(n) {
        var ordA = 'a'.charCodeAt(0);
        var ordZ = 'z'.charCodeAt(0);
        var len = ordZ - ordA + 1;
      
        var s = "";
        while(n >= 0) {
            s = String.fromCharCode(n % len + ordA) + s;
            n = Math.floor(n / len) - 1;
        }
        return s;
    }

// Example:

    for(n = 0; n < 125; n++)
            document.write(n + ":" + colName(n) + "<br>");

4

solved Convert numbers to letters beyond the 26 character alphabet