How many isosceles triangles with whole-number length sides have a perimeter of 28 units?
The two sides with the same length have to be longer than 7.
[8, 8, 12]
[9, 9, 10]
[10, 10, 8]
[11, 11, 6]
[12, 12, 4]
[13, 13, 2]
+539 
