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

0 vote258 views1 answer
Fade image out unity
C#Unity
3 votes244 views1 answer
Character Controller unity isGrounded is false
C#Unity
57 votes214 views10 answers
Bootstrap 4
C#
20 votes221 views2 answers
Change scale of an object unity
C#Unity
2 votes188 views1 answer
Format phone number in c# .net
C#
3 votes211 views1 answer
C# how to open file explorer
C#
0 vote246 views1 answer
Dependency Injection Create Scope at constructor
C#
2 votes219 views1 answer
C# socket receive
C#
4 votes199 views1 answer
C# minimize form
C#
1 vote169 views2 answers
Dotween sequence wait
C#