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

0 vote241 views1 answer
Unity conditional field
C#Unity
0 vote196 views1 answer
Reading Excel files from C#
C#
1 vote200 views1 answer
Wpf scrollviewer mouse wheel
C#
1 vote210 views1 answer
C# run c# code from string
C#
0 vote228 views2 answers
AudioSource unity
C#Unity
6 votes230 views1 answer
Unity call function on animation onstateexit
C#Unity
2 votes223 views1 answer
Move in the direction that player is facing unity
C#Unity
27 votes229 views3 answers
Unity textmesh pro
C#Unity
2 votes249 views2 answers
Wpf save file dialog
C#
4 votes223 views1 answer
How to reference a child object unity
C#Unity