I'm going to print the sigma from n=30 , i=1 ( i²+1) so can you help me to find my mistake

Question

#include <iostream>
#include <cmath>
using namespace std;

int main(){
int n=0;
int sum=0;
int i=1;
do{
cout<<"this program will calculate the sum of (i^2+1) , where i goes from 1 to n"<<endl;
cout<<"Enter the value for n:"<<endl;
cin>>n;
for(i=1;i<=30;i++){
sum=sum+1;

sum=pow(i,2)+1;
}

cout<<"the sum is "<<sum;

}while(0);
return 0;
}

Answer 1

You want find sigma (i^2+1), then why are you increasing sum by one....