Find sum of multiples of a number

// C# program to find sum of multiples
// of a number up to N efficiently
using System;
 
class GFG {
 
    // Function for calculating sum
    // of multiples of a upto N
    static int calculate_sum(int a, int N)
    {
 
        // Number of multiples
        int m = N / a;
 
        // sum of first m natural numbers
        int sum = m * (m + 1) / 2;
 
        // sum of multiples
        int ans = a * sum;
 
        return ans;
    }
 
    // Driver code
    public static void Main()
    {
 
        int a = 7, N = 49;
        Console.WriteLine("Sum of multiples of " + a +
         " up to " + N + " = " + calculate_sum(a, N));
    }
}

Source: geeksforgeeks.org

Similar codes

1 vote203 views1 answer
Remove session in dotnet core
C#
2 votes224 views1 answer
Convert int to string in linq query c#
C#
19 votes240 views2 answers
How to install pyaurogui on windows
C#
1 vote226 views1 answer
How to open new form on button click in c# xamarin
C#
0 vote225 views1 answer
Unity mousetoterrainposition
C#Unity
1 vote236 views1 answer
UnityWebRequest get returned data
C#Unity
0 vote221 views1 answer
Start wpf application when windows start
C#
6 votes214 views2 answers
Sum of two numbers in c#
C#
0 vote207 views1 answer
Get file id from mongodb without objectid using c#
C#
40 votes230 views3 answers
Unity print to console
C#