public static int Circulars(int range)
{
int count = 0;
HashSet <int> primes = new HashSet <int>();
primes.UnionWith(Primes.primeRange(range));
HashSet <string> stringprimes = new HashSet <string>();
stringprimes.UnionWith(primes.Select <int, string>(x => x.ToString()));
stringprimes.RemoveWhere(x => x.Contains('2') || x.Contains('4') || x.Contains('6') || x.Contains('8') || x.Contains('0'));
foreach (string number in stringprimes)
{
string varnumber = number.Substring(0);
bool allPrime = true;
for (int i = 0; i < number.Length; i++)
{
char c = varnumber.First <char>();
varnumber += c;
varnumber = varnumber.Remove(0, 1);
if (!primes.Contains(int.Parse(varnumber)))
{
//Console.WriteLine(number);
allPrime = false;
break;
}
}
if (allPrime == true)
{
count++;
}
allPrime = true;
}
return(count + 1);
}
public static int primes()
{
HashSet <int> primeList = new HashSet <int>();
primeList.UnionWith(Primes.primeRange(10000000));
List <string> primeStrings = Primes.primeRange(10000000).Select <int, string>(x => x.ToString()).ToList <string>();
int sum = 0;
StringBuilder reversed = new StringBuilder();
foreach (string s in primeStrings)
{
string workingstr = string.Copy(s);
string backworkingstr = reversed.Append(string.Copy(workingstr).Reverse <char>().ToArray <char>()).ToString();
reversed.Clear();
bool allPrime = true;
//Console.WriteLine(s);
while (workingstr.Length > 1 && backworkingstr.Length > 1)
{
workingstr = workingstr.Remove(workingstr.Length - 1);
backworkingstr = backworkingstr.Remove(backworkingstr.Length - 1);
//Console.WriteLine("{0}, {1}", workingstr, backworkingstr);
if (!primeList.Contains(int.Parse(workingstr)) || !primeList.Contains(int.Parse(backworkingstr)))
{
allPrime = false;
break;
}
}
if (allPrime == true)
{
Console.WriteLine(s);
sum += int.Parse(s);
}
}
return(sum);
}
static void Main(string[] args)
{
DateTime t = DateTime.Now;
switch (args.Length)
{
case 0:
Console.WriteLine("Bad input; no arguments");
break;
case 1:
if (args[0] == "--Nonabundant-sums")
{
Console.WriteLine(NonAbundSums.Sums());
}
else if (args[0] == "--lexo-permutations")
{
Console.WriteLine(lexicographicPermutation.getMillionth());
}
else if (args[0] == "--digit-fifth-powers")
{
Console.WriteLine(DigitFifthSums.FifthSums());
}
else if (args[0] == "--truncable-primes")
{
Console.WriteLine(TruncablePrimes.primes());
}
else if (args[0] == "--champ-constant")
{
Console.WriteLine(ChampernownesConstant.Product());
}
else if (args[0] == "--coded-triangle-numbers")
{
Console.WriteLine(TriangleNumbers.CodedTriangles());
}
break;
case 2:
if (args[0] == "--n-digit-fib")
{
Console.WriteLine(OneKDigitFib.NthDigitFib(int.Parse(args[1])));
}
else if (args[0] == "--number-spiral")
{
Console.WriteLine(NumberSpirals.spiralSum(int.Parse(args[1])));
}
else if (args[0] == "--amicable-numbers")
{
Console.WriteLine(Amicable_Numbers.Numbers(int.Parse(args[1])));
}
else if (args[0] == "--primes")
{
foreach (int i in Primes.primeRange(int.Parse(args[1])))
{
Console.Write("{0}, ", i);
}
}
else if (args[0] == "--circular-primes")
{
Console.WriteLine(CircularPrimes.Circulars(int.Parse(args[1])));
}
else if (args[0] == "--double-base-palindromes")
{
Console.WriteLine(DoubleBasePalindrome.PalindromeSum(int.Parse(args[1])));
}
else if (args[0] == "--minimum-subseq-product")
{
int[] Sequence = RandomSequence.RandomList(int.Parse(args[1]));
Console.Write("Array generated: ");
foreach (int i in Sequence)
{
Console.Write("{0}, ", i);
}
Console.WriteLine();
Console.WriteLine(Subsequence.MinimumSubSequenceProductNaive(Sequence));
Console.WriteLine(Subsequence.MinimumSubsequenceProduct(Sequence));
}
/*else if (args[0] == "--coin-sums") {
* Console.WriteLine(CoinSums.Sums(int.Parse(args[1])));
* }*/
break;
case 3:
if (args[0] == "--distinct-powers")
{
Console.WriteLine(Distinct_Powers.DistinctPowers(int.Parse(args[1]), int.Parse(args[2])));
}
else if (args[0] == "--lattice-paths")
{
Console.WriteLine(LatticePaths.numPaths(int.Parse(args[1]), int.Parse(args[2])));
}
break;
}
Console.WriteLine("Time elapsed: {0}", t - DateTime.Now);
Console.Read();
}