JavaScript: Pronic number

Last update on April 22 2023 12:19:13 (UTC/GMT +8 hours)

JavaScript Math: Exercise-72 with Solution

Write a JavaScript program to check if a given number is pronic using the product of two consecutive numbers. If the number is pronic return true otherwise false.

From Wikipedia –
A pronic number is a number that is the product of two consecutive integers, that is, a number of the form n(n+1). The study of these numbers dates back to Aristotle. They are also called oblong numbers, heteromecic numbers, or rectangular numbers; however, the term "rectangular number" has also been applied to the composite numbers.
The first few pronic numbers are:
0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462 ...

Sample Data:
6 -> true
110 -> true
200 -> false

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Pronic number</title>
</head>
<body>

</body>
</html>

JavaScript Code:

const is_Pronic = (n) => {
  if (n === 0) {
    return true
  }
  const sqrt = Math.sqrt(n)
  return sqrt % 1 !== 0 && Math.ceil(sqrt) * Math.floor(sqrt) === n
}

console.log(is_Pronic(6))
console.log(is_Pronic(110))
console.log(is_Pronic(200))

Sample Output:

true
true
false

Flowchart:

$JavaScript Math flowchart of JavaScript Pronic number$

Live Demo:

See the Pen javascript-math-exercise-72 by w3resource (@w3resource) on CodePen.

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