Javascript script to calculate n-th element of Triangle Numbers sequence.

// © 2017 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net

<html>
<body>
    Enter a number:  <input type="text" id="data">
    <button onclick="calculate()">Convert</button>
    <p>Triangle Number is equal to</p>
    <p id="newText"></p>

    <script>
        function calculate(){
            var data = document.getElementById("data").value;
            var n = parseInt(data);
            
            document.getElementById("newText").innerHTML = triangleNumber(n);      
        }

        function triangleNumber(n)
        {
            return (n * (n + 1)) / 2;
        }
    </script>
</body>
</html>

 

Javascript Triangle Number
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