public static string ListSquared(long m, long n)
{
int count = 1;
var strFinal = "[";
for (long i = m; i < n + 1; i++)
{
// find divisors
var listOfDivisors = SumSquaredDivisors.FindDivisors(i);
// add square of divisors
var divisorsSquaredAggregate = listOfDivisors.Aggregate(0, (long total, long next) => total + (next * next));
// check if above is a perfect square
var sqRoot = Math.Floor(Math.Floor(Math.Sqrt(divisorsSquaredAggregate)));
// if perfect square init 2 element array; place number and sum of squares in array
//var isPerfectSquare = false;
if (sqRoot * sqRoot == divisorsSquaredAggregate)
{
//isPerfectSquare = true;
var str = String.Format("[{0}, {1}]", i, divisorsSquaredAggregate);
if (count > 1)
{
strFinal += ", " + str;
}
else
{
strFinal += str;
}
count++;
}
}
strFinal += "]";
return(strFinal);
}
static void Main(string[] args)
{
var x = SumSquaredDivisors.ListSquared(1, 250);
Console.WriteLine(x);
}
