public static bool IsHappyNumber(this uint number)
{
uint sum = HappyNumber.SumDigitsPowTwo(number);
return(IsHappyNumber(sum, new List <uint> {
sum
}));
}
private static bool IsHappyNumber(uint number, List <uint> sums)
{
uint sum = HappyNumber.SumDigitsPowTwo(number);
if (sum == 1)
{
return(true);
}
if (sums.Contains(sum))
{
return(false);
}
sums.Add(sum);
return(IsHappyNumber(sum, sums));
}
