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Program to find the sum of a Series (1*1) + (2*2) + (3*3) + (4*4) + (5*5) + … + (n*n)
  • Difficulty Level : Easy
  • Last Updated : 21 Nov, 2018

You have been given a series (1*1) + (2*2) + (3*3) + (4*4) + (5*5) + … + (n*n), find out the sum of the series till nth term.
Examples :

Input : n = 3
Output : 14
Explanation : 1 + 1/2^2 + 1/3^3

Input : n = 5
Output : 55
Explanation : (1*1) + (2*2) + (3*3) + (4*4) + (5*5)

C++

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// CPP program to calculate the following series
#include<iostream>
using namespace std;
  
// Function to calculate the following series
int Series(int n)
{
    int i;
    int sums = 0;
    for (i = 1; i <= n; i++)
        sums += (i * i);
    return sums;
}
  
// Driver Code
int main()
{
    int n = 3;
    int res = Series(n);
    cout<<res<<endl;
}

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C

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// C program to calculate the following series
#include <stdio.h>
  
// Function to calculate the following series
int Series(int n)
{
    int i;
    int sums = 0;
    for (i = 1; i <= n; i++)
        sums += (i * i);
    return sums;
}
  
// Driver Code
int main()
{
    int n = 3;
    int res = Series(n);
    printf("%d", res);
}

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Java

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// Java program to calculate the following series
import java.io.*;
class GFG {
  
    // Function to calculate the following series
    static int Series(int n)
    {
        int i;
        int sums = 0;
        for (i = 1; i <= n; i++)
            sums += (i * i);
        return sums;
    }
  
    // Driver Code
    public static void main(String[] args)
    {
        int n = 3;
        int res = Series(n);
        System.out.println(res);
    }
}

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Python

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# Python program to calculate the following series
def Series(n):
    sums = 0
    for i in range(1, n + 1):
        sums += (i * i);
    return sums
  
# Driver Code
n = 3
res = Series(n)
print(res)

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C#

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// C# program to calculate the following series
using System;
class GFG {
  
    // Function to calculate the following series
    static int Series(int n)
    {
        int i;
        int sums = 0;
        for (i = 1; i <= n; i++)
            sums += (i * i);
        return sums;
    }
  
    // Driver Code
    public static void Main()
    {
        int n = 3;
        int res = Series(n);
        Console.Write(res);
    }
}
  
// This code is contributed by vt_m.

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PHP

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<?php
// PHP program to calculate
// the following series
  
// Function to calculate the
// following series
function Series($n)
{
    $i;
    $sums = 0;
    for ($i = 1; $i <= $n; $i++)
        $sums += ($i * $i);
    return $sums;
}
  
// Driver Code
$n = 3;
$res = Series($n);
echo($res);
  
// This code is contributed by Ajit.
?>

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Output :

14

Time Complexity: O(n)

Please refer below post for O(1) solution.
Sum of squares of first n natural numbers

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