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WoodallNumbers.cs
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WoodallNumbers.cs
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using System;
namespace IntegerSequences.WoodallNumbers
{
class WoodallNumbers
{
// The first few Woodall numbers are: 1, 7, 23, 63, 159, 383, 895, 2047, 4607
private static double Woodall(int n)
{
n++; // Woodall formulas works with n >= 1
return n * Math.Pow(2, n) - 1;
}
public static void Main(string[] args)
{
Console.WriteLine("Please enter an integer n where n >= 0");
bool isValid = false;
int nTH = 0;
while (!isValid) // Check if user input an integer. If not, tries again until an integer is inputted
{
try
{
string input = Console.ReadLine();
nTH = int.Parse(input);
}
catch (FormatException)
{
Console.WriteLine("Please enter an intenger n where n >= 0");
continue;
}
isValid = true;
}
String s = String.Format("The {0}th element from Fermat numbers is {1}", nTH + 1, Woodall(nTH));
Console.WriteLine(s);
}
}
}