1+5+9+13+......+nth term.c

#include <stdio.h>
int main()
{
    int i,j=1,n,sum=0;
    
    printf("Enter the value of N: ");
    scanf("%d", &n);
    
    for(i=1; i<=n; i++)
        {
            sum=sum+j;
            j=j+4;
        }
        
    printf("\nSum of the total value : %d\n\n", sum);
    
    return 0;
}


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Output--

Enter the value of N: 15

Sum of the total value : 435