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

4 votes253 views2 answers
Check if gameobject exists unity
C#Unity
0 vote196 views1 answer
Map user to ConnectionId SignalR
C#
2 votes185 views1 answer
C# linq extension methods left join
C#
0 vote180 views1 answer
C# int.parse input string wasnt in correct format
C#
1 vote203 views1 answer
Unity normalize float
C#
12 votes183 views4 answers
C# console writeline array
C#
0 vote282 views1 answer
Unity c# hooke's law suspension
C#Unity
29 votes221 views3 answers
Unity key detection
C#
0 vote189 views1 answer
WebClient c# with custom user agent
C#
1 vote194 views1 answer
There is already a virtual axis named Horizontal registered. unity
C#