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

5 votes136 views2 answers
Iso date format c#
C#
1 vote152 views1 answer
Read configuration workerservice
C#
0 vote148 views1 answer
Vector2.zero unity
C#
20 votes141 views4 answers
Generate random string C#
C#
1 vote123 views1 answer
Bower azure repository tag
C#
0 vote132 views1 answer
How to make continuous progress bar
C#
1 vote146 views1 answer
How to draw over label C#
C#
13 votes172 views3 answers
Print random number unity
C#Unity
0 vote123 views1 answer
Close an open form when you open it again c#
C#
0 vote139 views1 answer
C# write to lines without extra line
C#