Largest prime factor of a number

		static long LargestFactor(long n)
        {
            long lastFactor;
            if (n%2==0)
            {
                lastFactor = 2;
                n/=2;
                while (n % 2 == 0)
                    n/=2;
            }
            else
            {
                lastFactor = 1;
            }
            long factor = 3;
            long maxFactor = Convert.ToInt64(Math.Sqrt(n));
            while (n > 1 && factor <= maxFactor)
            {
                if(n % factor == 0)
                {
                    n/=factor;
                    lastFactor=factor;
                    while (n % factor == 0)
                        n/= factor;
                    maxFactor = Convert.ToInt64(Math.Sqrt(n));
                }
                factor += 2;
            }
            if (n == 1)
                return lastFactor;
            else
                return n;
        }

Source: icodeblock.blogspot.com

Similar codes

3 votes272 views1 answer
Split with multiple delimiters c#
C#
10 votes261 views6 answers
Remove substring from string c#
C#
14 votes264 views2 answers
Computer
C#
0 vote259 views1 answer
Hello world in unity c#
C#
0 vote276 views1 answer
Unity mix gradient colors
C#
0 vote279 views1 answer
Hdrp lit change emmision values
C#
0 vote270 views1 answer
How to pick a random item in c#
C#
10 votes281 views2 answers
How to set a color of text in unity 2020 script
C#
0 vote271 views1 answer
C# httpclient post no content
C#
0 vote293 views1 answer
Sum the digits in c#
C#