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N-th term in the series 1, 11, 55, 239, 991,…in C++
The given series is 1, 11, 55, 239, 991...
If you clearly observe the series, you will find that the n-th number is 4n-2n-1.
Algorithm
- Initialise the number N.
- Use the series formula to compute the n-th term.
- Print the result.
Implementation
Following is the implementation of the above algorithm in C++
#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
Updated on: 22-Oct-2021
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