public string Solve()
{
var words = GetWords();
var wordValues = words.Select(GetWordValue).ToArray();
var maxValue = wordValues.Max();
var triangleValues = new HashSet <long>(Sequences.TriangleNumbers().TakeWhile(x => x < maxValue));
return(wordValues.Count(x => triangleValues.Contains(x)).ToString());
}
public string Solve()
{
return(Sequences.TriangleNumbers().First(t => GetFactors(t).Count > 500).ToString());
}