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Centered heptagonal number

In this article, we will explore the concept of centered heptagonal numbers and understand how to generate these numbers using a simple formula. Centered heptagonal numbers are a type of figurate numbers that can be visualized as dots arranged in the shape of a regular heptagon, with additional dots added to the center. These numbers have a fascinating pattern and can be found in various mathematical and geometric contexts.

Problem Statement: The problem is to generate the first 'k' centered heptagonal numbers, where 'k' is a positive integer provided by the user. For each value of 'n' from 1 to 'k', we need to calculate the corresponding centered heptagonal number using the formula:

Heptagonal(n) = (7 * n^2 - 7 * n + 2) / 2

Pseudocode:

centeredHeptagonalNo(k):
    for n from 1 to k:
        result = (7 * n^2 - 7 * n + 2) / 2
        print result

Algorithm Explanation

  1. Start the function centeredHeptagonalNo that takes 'k' as input, representing the number of centered heptagonal numbers to be generated.

  2. Initialize a loop from 'n' = 1 to 'k'.

  3. Within the loop, apply the formula for centered heptagonal numbers, i.e., result = (7 * n^2 - 7 * n + 2) / 2.

  4. Print the value of result for each 'n', which represents the centered heptagonal number for the given value of 'n'.

  5. End the loop.

  6. End the function.

Example

Let's take 'k' = 5 as an example to demonstrate the algorithm:

  1. Start with 'n' = 1: result = (7 * 1^2 - 7 * 1 + 2) / 2 = (7 - 7 + 2) / 2 = 2 / 2 = 1 The first centered heptagonal number is 1.

  2. Increment 'n' to 2: result = (7 * 2^2 - 7 * 2 + 2) / 2 = (28 - 14 + 2) / 2 = 16 / 2 = 8 The second centered heptagonal number is 8.

  3. Increment 'n' to 3: result = (7 * 3^2 - 7 * 3 + 2) / 2 = (63 - 21 + 2) / 2 = 44 / 2 = 22 The third centered heptagonal number is 22.

  4. Increment 'n' to 4: result = (7 * 4^2 - 7 * 4 + 2) / 2 = (112 - 28 + 2) / 2 = 86 / 2 = 43 The fourth centered heptagonal number is 43.

  5. Increment 'n' to 5: result = (7 * 5^2 - 7 * 5 + 2) / 2 = (175 - 35 + 2) / 2 = 142 / 2 = 71 The fifth centered heptagonal number is 71.

Code Solution

Here given code implementation process.

// C Program for
// Centered heptagonal number
#include <stdio.h>

void centeredHeptagonalNo(int k)
{
	// Print all initial k centered heptagonal number
	for (int n = 1; n <= k; ++n)
	{
		// Formula
		//   (7n² - 7n + 2) 
		//   ————————————————
		//         2
      
		// Calculate nth heptagonal number
		int result = (7 *(n *n) - 7 *n + 2) / 2;
		// Display Calculated value
		printf("  %d", result);
	}
}
int main()
{
	// Centered heptagonal number are
	// —————————————————————————————————————————————
	//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	// 4922, 5188, 5461, 5741, 6028 ... etc
	// n = 10
	centeredHeptagonalNo(10);
	return 0;
}

Output

  1  8  22  43  71  106  148  197  253  316
// Java program for
// Centered heptagonal number
public class CenteredHeptagonal
{
	public void centeredHeptagonalNo(int k)
	{
		// Print all initial k centered heptagonal number
		for (int n = 1; n <= k; ++n)
		{
			// Formula
			//   (7n² - 7n + 2) 
			//   ————————————————
			//         2
          
			// Calculate nth heptagonal number
			int result = (7 * (n * n) - 7 * n + 2) / 2;
          
			// Display Calculated value
			System.out.print(" " + result);
		}
	}
	public static void main(String[] args)
	{
		CenteredHeptagonal task = new CenteredHeptagonal();
		// Centered heptagonal number are
		// —————————————————————————————————————————————
		//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
		// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
		// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
		// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
		// 4922, 5188, 5461, 5741, 6028 ... etc
		// n = 10
		task.centeredHeptagonalNo(10);
	}
}

Output

 1 8 22 43 71 106 148 197 253 316
// Include header file
#include <iostream>
using namespace std;
// C++ program for
// Centered heptagonal number
class CenteredHeptagonal
{
	public: void centeredHeptagonalNo(int k)
	{
		// Print all initial k centered heptagonal number
		for (int n = 1; n <= k; ++n)
		{
			// Formula
			//   (7n² - 7n + 2) 
			//   ————————————————
			//         2
          
			// Calculate nth heptagonal number
			int result = (7 *(n *n) - 7 *n + 2) / 2;
          
			// Display Calculated value
			cout << " " << result;
		}
	}
};
int main()
{
	CenteredHeptagonal *task = new CenteredHeptagonal();
	// Centered heptagonal number are
	// —————————————————————————————————————————————
	//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	// 4922, 5188, 5461, 5741, 6028 ... etc
	// n = 10
	task->centeredHeptagonalNo(10);
	return 0;
}

Output

 1 8 22 43 71 106 148 197 253 316
// Include namespace system
using System;
// Csharp program for
// Centered heptagonal number
public class CenteredHeptagonal
{
	public void centeredHeptagonalNo(int k)
	{
		// Print all initial k centered heptagonal number
		for (int n = 1; n <= k; ++n)
		{
			// Formula
			//   (7n² - 7n + 2) 
			//   ————————————————
			//         2
			// Calculate nth heptagonal number
			int result = (7 * (n * n) - 7 * n + 2) / 2;
			// Display Calculated value
			Console.Write(" " + result);
		}
	}
	public static void Main(String[] args)
	{
		CenteredHeptagonal task = new CenteredHeptagonal();
		// Centered heptagonal number are
		// —————————————————————————————————————————————
		//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
		// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
		// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
		// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
		// 4922, 5188, 5461, 5741, 6028 ... etc
		// n = 10
		task.centeredHeptagonalNo(10);
	}
}

Output

 1 8 22 43 71 106 148 197 253 316
package main
import "fmt"
// Go program for
// Centered heptagonal number

func centeredHeptagonalNo(k int) {
	// Print all initial k centered heptagonal number
	for n := 1 ; n <= k ; n++ {
		// Formula
		//   (7n² - 7n + 2) 
		//   ————————————————
		//         2

		// Calculate nth heptagonal number
		var result int = (7 * (n * n) - 7 * n + 2) / 2
		
		// Display Calculated value
		fmt.Print(" ", result)
	}
}
func main() {

	// Centered heptagonal number are
	// —————————————————————————————————————————————
	//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	// 4922, 5188, 5461, 5741, 6028 ... etc
	// test k = 10
	centeredHeptagonalNo(10)
}

Output

 1 8 22 43 71 106 148 197 253 316
<?php
// Php program for
// Centered heptagonal number
class CenteredHeptagonal
{
	public	function centeredHeptagonalNo($k)
	{
		// Print all initial k centered heptagonal number
		for ($n = 1; $n <= $k; ++$n)
		{
			// Formula
			//   (7n² - 7n + 2) 
			//   ————————————————
			//         2
			// Calculate nth heptagonal number
			$result = (int)((7 * ($n * $n) - 7 * $n + 2) / 2);
			// Display Calculated value
			echo(" ".$result);
		}
	}
}

function main()
{
	$task = new CenteredHeptagonal();
	// Centered heptagonal number are
	// —————————————————————————————————————————————
	//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	// 4922, 5188, 5461, 5741, 6028 ... etc
	// n = 10
	$task->centeredHeptagonalNo(10);
}
main();

Output

 1 8 22 43 71 106 148 197 253 316
// Node JS program for
// Centered heptagonal number
class CenteredHeptagonal
{
	centeredHeptagonalNo(k)
	{
		// Print all initial k centered heptagonal number
		for (var n = 1; n <= k; ++n)
		{
			// Formula
			//   (7n² - 7n + 2) 
			//   ————————————————
			//         2
          
			// Calculate nth heptagonal number
			var result = parseInt((7 * (n * n) - 7 * n + 2) / 2);
			// Display Calculated value
			process.stdout.write(" " + result);
		}
	}
}

function main()
{
	var task = new CenteredHeptagonal();
	// Centered heptagonal number are
	// —————————————————————————————————————————————
	//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	// 4922, 5188, 5461, 5741, 6028 ... etc
	// n = 10
	task.centeredHeptagonalNo(10);
}
main();

Output

 1 8 22 43 71 106 148 197 253 316
#  Python 3 program for
#  Centered heptagonal number
class CenteredHeptagonal :
	def centeredHeptagonalNo(self, k) :
		n = 1
		#  Print all initial k centered heptagonal number
		while (n <= k) :
			#  Formula
			#    (7n² - 7n + 2) 
			#    ————————————————
			#          2
            
			#  Calculate nth heptagonal number
			result = int((7 * (n * n) - 7 * n + 2) / 2)

			#  Display Calculated value
			print(" ", result, end = "")
			n += 1
		
	

def main() :
	task = CenteredHeptagonal()
	#  Centered heptagonal number are
	#  —————————————————————————————————————————————
	#   1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	#  386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	#  1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	#  3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	#  4922, 5188, 5461, 5741, 6028 ... etc
    
	#  Test k = 10
	task.centeredHeptagonalNo(10)

if __name__ == "__main__": main()

Output

  1  8  22  43  71  106  148  197  253  316
#  Ruby program for
#  Centered heptagonal number
class CenteredHeptagonal 
	def centeredHeptagonalNo(k) 
		n = 1
		#  Print all initial k centered heptagonal number
		while (n <= k) 
			#  Formula
			#    (7n² - 7n + 2) 
			#    ————————————————
			#          2
            
			#  Calculate nth heptagonal number
			result = (7 * (n * n) - 7 * n + 2) / 2

			#  Display Calculated value
			print(" ", result)
			n += 1
		end

	end

end

def main() 
	task = CenteredHeptagonal.new()
	#  Centered heptagonal number are
	#  —————————————————————————————————————————————
	#   1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	#  386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	#  1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	#  3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	#  4922, 5188, 5461, 5741, 6028 ... etc
	
    #  Test n = 10
	task.centeredHeptagonalNo(10)
end

main()

Output

 1 8 22 43 71 106 148 197 253 316
// Scala program for
// Centered heptagonal number
class CenteredHeptagonal()
{
	def centeredHeptagonalNo(k: Int): Unit = {
		var n: Int = 1;
		// Print all initial k centered heptagonal number
		while (n <= k)
		{
			// Formula
			//   (7n² - 7n + 2) 
			//   ————————————————
			//         2
          
			// Calculate nth heptagonal number
			var result: Int = (7 * (n * n) - 7 * n + 2) / 2;
          
			// Display Calculated value
			print(" " + result);
			n += 1;
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: CenteredHeptagonal = new CenteredHeptagonal();
		// Centered heptagonal number are
		// —————————————————————————————————————————————
		//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
		// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
		// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
		// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
		// 4922, 5188, 5461, 5741, 6028 ... etc
		// test k = 10
		task.centeredHeptagonalNo(10);
	}
}

Output

 1 8 22 43 71 106 148 197 253 316
// Swift 4 program for
// Centered heptagonal number
class CenteredHeptagonal
{
	func centeredHeptagonalNo(_ k: Int)
	{
		var n: Int = 1;
		// Print all initial k centered heptagonal number
		while (n <= k)
		{
			// Formula
			//   (7n² - 7n + 2) 
			//   ————————————————
			//         2
          
			// Calculate nth heptagonal number
			let result: Int = (7 * (n * n) - 7 * n + 2) / 2;
          
			// Display Calculated value
			print(" ", result, terminator: "");
			n += 1;
		}
	}
}
func main()
{
	let task: CenteredHeptagonal = CenteredHeptagonal();
	// Centered heptagonal number are
	// —————————————————————————————————————————————
	//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	// 4922, 5188, 5461, 5741, 6028 ... etc
  
	// test k = 10
	task.centeredHeptagonalNo(10);
}
main();

Output

  1  8  22  43  71  106  148  197  253  316
// Kotlin program for
// Centered heptagonal number
class CenteredHeptagonal
{
	fun centeredHeptagonalNo(k: Int): Unit
	{
		var n: Int = 1;
		// Print all initial k centered heptagonal number
		while (n <= k)
		{
			// Formula
			//   (7n² - 7n + 2) 
			//   ————————————————
			//         2
			// Calculate nth heptagonal number
			val result: Int = (7 * (n * n) - 7 * n + 2) / 2;
			// Display Calculated value
			print(" " + result);
			n += 1;
		}
	}
}
fun main(args: Array < String > ): Unit
{
	val task: CenteredHeptagonal = CenteredHeptagonal();
	// Centered heptagonal number are
	// —————————————————————————————————————————————
	//  1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 
	// 386, 463, 547, 638, 736, 841, 953, 1072, 1198, 1331, 
	// 1471, 1618, 1772, 1933, 2101, 2276, 2458, 2647, 2843, 
	// 3046, 3256, 3473, 3697, 3928, 4166, 4411, 4663, 
	// 4922, 5188, 5461, 5741, 6028 ... etc
  
	// Test k = 10
	task.centeredHeptagonalNo(10);
}

Output

 1 8 22 43 71 106 148 197 253 316

Resultant Output Explanation

The function centeredHeptagonalNo(5) will output the first five centered heptagonal numbers: 1, 8, 22, 43, and 71.

Time Complexity

The time complexity of the code is O(k) because the loop runs from 1 to 'k', and for each iteration, a constant amount of computation is performed. As 'k' increases, the time taken will be directly proportional to 'k'.

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