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 vote334 views1 answer
How to turn off sprite renderer in unity
C#
0 vote386 views1 answer
Web socket background.js example
C#
0 vote346 views1 answer
Unity camera follow with lerp
C#
39 votes334 views4 answers
React for loop
C#
-1 vote360 views1 answer
Write text in C#
C#
4 votes350 views1 answer
How to write coroutine in unity
C#
1 vote338 views1 answer
Unity key up
C#
0 vote316 views1 answer
Destructure array in c#
C#
1 vote358 views3 answers
C# get string in parentheses
C#
0 vote340 views2 answers
How to show a first item in a combobox in c# winforms
C#