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 vote139 views1 answer
C# how to use or operator on integers in while loop
C#
27 votes157 views2 answers
Find gameobject with tag
C#
2 votes137 views1 answer
Move to another scene unity
C#
13 votes163 views1 answer
Change sprite of gameobject unity
C#
0 vote162 views1 answer
Linq query get last day of month
C#
0 vote158 views1 answer
How can datetimepicker accept hour as well
C#
1 vote202 views1 answer
Unity detect number key
C#Unity
0 vote138 views1 answer
How to read particular line of file in c#
C#
0 vote141 views1 answer
Asp.net issue
C#
0 vote137 views1 answer
Unity using tmpro not working
C#