public static long TriangularPentagonalHexagonal()
{
var h = 144;
long hexagonal;
do
{
hexagonal = TriPenHexNumbers.HexagonalNumber(h++);
} while (!(TriPenHexNumbers.IsPentagonNumber(hexagonal) &&
TriPenHexNumbers.IsTriangleNumber(hexagonal)));
return(hexagonal);
}
public static int NumTriangleWords()
{
var triangleNumbers = new List <int> {
1
};
var numTriangleWords = 0;
foreach (var word in _words)
{
var wordNumber = word.Select(w => _dictionary[w]).Sum();
if (TriPenHexNumbers.IsTriangleNumber(wordNumber))
{
numTriangleWords++;
}
}
return(numTriangleWords);
}