📜  十三边形数

📅  最后修改于: 2021-10-23 08:53:03             🧑  作者: Mango

给定一个数N ,任务是找到第N十三边形数

例子:

方法:第N十三边形数由以下公式给出:

Tn = (11n^2 - 9n)/2

下面是上述方法的实现:

C++
// C++ program to find N-th
// Tridecagonal number
 
#include 
using namespace std;
 
// Function to find N-th
// Tridecagonal number
int Tridecagonal_num(int n)
{
    // Formula to calculate nth
    // Tridecagonal number
    return (11 * n * n - 9 * n) / 2;
}
 
// Driver Code
int main()
{
    int n = 3;
    cout << Tridecagonal_num(n) << endl;
     
    n = 10;
 
    cout << Tridecagonal_num(n) << endl;
 
    return 0;
}


Java
// Java program to find N-th
// tridecagonal number
class GFG{
 
// Function to find N-th
// tridecagonal number
static int Tridecagonal_num(int n)
{
     
    // Formula to calculate nth
    // tridecagonal number
    return (11 * n * n - 9 * n) / 2;
}
 
// Driver Code
public static void main(String[] args)
{
    int n = 3;
    System.out.print(Tridecagonal_num(n) + "\n");
     
    n = 10;
    System.out.print(Tridecagonal_num(n) + "\n");
}
}
 
// This code is contributed by Princi Singh


Python3
# Python3 program to find N-th
# tridecagonal number
 
# Function to find N-th
# tridecagonal number
def Tridecagonal_num(n):
     
    # Formula to calculate nth
    # tridecagonal number
    return (11 * n * n - 9 * n) / 2
 
# Driver Code
n = 3
print(int(Tridecagonal_num(n)))
 
n = 10
print(int(Tridecagonal_num(n)))
 
# This code is contributed by divyeshrabadiya07


C#
// C# program to find N-th
// tridecagonal number
using System;
 
class GFG{
 
// Function to find N-th
// tridecagonal number
static int Tridecagonal_num(int n)
{
     
    // Formula to calculate nth
    // tridecagonal number
    return (11 * n * n - 9 * n) / 2;
}
 
// Driver Code
public static void Main(String[] args)
{
    int n = 3;
    Console.Write(Tridecagonal_num(n) + "\n");
     
    n = 10;
    Console.Write(Tridecagonal_num(n) + "\n");
}
}
 
// This code is contributed by Rajput-Ji


Javascript


输出:
36
505

参考: https : //en.wikipedia.org/wiki/Polygonal_number

如果您希望与专家一起参加现场课程,请参阅DSA 现场工作专业课程学生竞争性编程现场课程