def test_factors(self):
self.assertEqual([1], numbers.factors(1))
self.assertEqual([1, 3], numbers.factors(3))
self.assertEqual([1, 2, 3, 6], numbers.factors(6))
self.assertEqual([1, 2, 5, 10], numbers.factors(10))
self.assertEqual([1, 3, 5, 15], numbers.factors(15))
self.assertEqual([1, 3, 7, 21], numbers.factors(21))
self.assertEqual([1, 2, 4, 7, 14, 28], numbers.factors(28))
def problem012(n):
i = 1
while len(numbers.factors(numbers.triangle_number(i))) < n:
i = i + 1
return numbers.triangle_number(i)
