public long GetNext(long next)
{
while (true)
{
var nextTriangleNumber = TriangleNumber.GetNumber(next);
if (Pentagonnumber.GetN(nextTriangleNumber) > 0 && HexagonalNumber.GetN(nextTriangleNumber) > 0)
{
return(nextTriangleNumber);
}
next++;
}
}
public void TestTriangleGetN(long n, int tn)
{
Assert.Equal(tn, Pentagonnumber.GetN(n));
}