N-th term in the series 1, 11, 55, 239, 991,…in C++

C++Server Side ProgrammingProgramming

In this tutorial, we are going to write a program that finds the n-th number in the series 1, 11, 55, 239, 991...

If you clearly observe the series, you will find that the n-th number is 4n-2n-1n > 0

Example

Let's see the code.

 Live Demo

#include <bits/stdc++.h>
using namespace std;
int getNthTerm(int n) {
   int num = pow(4, n) - pow(2, n) - 1;
   return num;
}
int main() {
   int n = 7;
   cout << getNthTerm(n) << endl;
   return 0;
}

Output

If you run the above code, then you will get the following result.

16255

Conclusion

If you have any queries in the tutorial, mention them in the comment section.

raja
Hafeezul Kareem
Published on 29-Jun-2021 09:31:01
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