JavaScript: Pronic number

JavaScript Math: Exercise-72 with Solution

Check Pronic Number

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:

JavaScript Code:

/**
 * Checks if a given number is a pronic number.
 * @param {number} n - The number to check.
 * @returns {boolean} - True if the number is pronic, false otherwise.
 */
const is_Pronic = (n) => {
  // Check if the number is 0 (0 is considered a pronic number)
  if (n === 0) {
    return true;
  }
  
  // Calculate the square root of the number
  const sqrt = Math.sqrt(n);
  
  // Check if the square root is not an integer and the product of the ceiling and floor of the square root is equal to the number
  return sqrt % 1 !== 0 && Math.ceil(sqrt) * Math.floor(sqrt) === n;
};

// Test the function with different numbers
console.log(is_Pronic(6));   // Output: true
console.log(is_Pronic(110)); // Output: true 
console.log(is_Pronic(200)); // Output: false

Output:

true
true
false

Flowchart:

Live Demo:

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

For more Practice: Solve these Related Problems:

• Write a JavaScript function that checks if a given number can be expressed as n*(n+1) for some integer n.
• Write a JavaScript function that iterates through potential factors to determine if the product of two consecutive integers equals the given number.
• Write a JavaScript function that validates the input and returns a boolean indicating whether the number is pronic.
• Write a JavaScript function that calculates candidate values for n and verifies if n*(n+1) matches the input number.

Go to:

• JavaScript Math and Numbers Exercises Home ↩
• JavaScript Exercises Home ↩

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