JavaScript/PentagonalNumber.html at master · skatheriya/JavaScript · GitHub

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<html>

<head>
    <title>Pentagonal Number</title>
    <script>
        let num = +prompt("Enter no. of iteration");

        if (num == 0) {
            alert("Zero Not Allowed");
        } else {
            if (num < 0) {
                alert("Negative No. Not Allowed");
            } else {
                alert(PentagonalNumber(num))
            }
        }

        function PentagonalNumber(num) {
            let total = 1;
            for (let i = 0; i < num; i++) {
                total = total + (i * 5);
            }
            return total;
        };
    </script>
</head>

<body>

</body>

</html>