Question

Write a program to find the sum of the following series:

S = `2/a + 3/a^2 + 5/a^3 + 7/a^4 + ........................... "to n"`

Answer 1

import java.util.*;
public class Q1e
{ public static void main(String args[])
{ int a, i, n = 1, cnt, t, iter = 0;
double term, sum = 0; 
Scanner obj = new Scanner(System.in);
System.out.println("Enter the number of terms");
t = obj.nextInt();
System.out.println("Enter the value of a");
a = obj.nextInt();
     while (true)
     {
   cnt = 0; // reset to zero
     for (i = 1; i <= n; i++)
   { if (n % i == 0)
cnt++;
     if (i == n)break;
     }
     if (cnt == 2) // if cnt is 2 then the number is prime
     {term = i / Math.pow(a, iter);
     if (t == iter)
     break;
     else
     sum += term;
     }
     n++;

}
System.out.println(sum);
}}