### Challenge: Distinct Powers

Posted on: August 23, 2017 10:17:27 PM

Consider all integer combinations of ab for 2 ≤ a ≤ 5 and 2 ≤ b ≤ 5:

22=4, 23=8, 24=16, 25=32
32=9, 33=27, 34=81, 35=243
42=16, 43=64, 44=256, 45=1024
52=25, 53=125, 54=625, 55=3125

If they are then placed in numerical order, with any repeats removed, we get the following sequence of 15 distinct terms:

4, 8, 9, 16, 25, 27, 32, 64, 81, 125, 243, 256, 625, 1024, 3125

How many distinct terms are in the sequence generated by ab for 2 ≤ a ≤ 100 and 2 ≤ b ≤ 100?

This was very straight forward for me. The most simple way to do this is a simple brute force option. There are ways to calculate out most of the duplicates, but those calculations end up taking longer than 2 simple loops and feed the results into a hashset to guarantee uniqueness to get the answer.
Program.cs
```using System;
using System.Collections.Generic;
using System.Diagnostics;

namespace Project_Euler_29
{
internal class Program
{
private static void Main(string[] args)
{
Stopwatch sw = Stopwatch.StartNew();
HashSet<double> results = new HashSet<double>();

for (int a = 2; a <= 100; a++)
{
for (int b = 2; b <= 100; b++)
{
}
}

sw.Stop();

Console.WriteLine(\$"Number of distinct powers: {results.Count}");
Console.WriteLine(\$"Took {sw.ElapsedMilliseconds}ms");
}
}
}
```

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