private static int LengthPrimes(int i, int j)
{
int counter = 0;
while (ExtraNumbers.IsPrime(counter * counter + i * counter + j))
{
counter++;
}
return(counter);
}
static void Main(string[] args)
{
List <string> permutations = ExtraNumbers.AllPermutations("7654321");
foreach (string s in permutations)
{
if (ExtraNumbers.IsPrime(int.Parse(s)))
{
Console.WriteLine(s);
break;
}
}
Console.ReadLine();
}