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 vote287 views2 answers
While coding c# i get the error : "Duplicate 'global::System.Runtime.Versioning.TargetFrameworkAttribute' attribute [first_better_project]"
C#
0 vote314 views1 answer
Remove force unity
C#Unity
2 votes352 views1 answer
Find closest gameobject unity
C#Unity
1 vote328 views1 answer
C# check if string is path or file
C#
0 vote271 views1 answer
C# sc create service
C#
0 vote274 views1 answer
Ip validation .net core
C#
0 vote291 views1 answer
EventSource Web API C#
C#
11 votes290 views3 answers
C sharp list of strings
C#
0 vote292 views1 answer
C# How to change the text colour?
C#
0 vote316 views1 answer
Authenticatecoreasync owin not hadling exception handlers
C#