The above table shows 6, 24, and 54 are all sum-difference numbers. Note that 24 = 6(22) and 54 = 6(32), etc. So it appears that any square multiplied by six also gives a sum-difference number.
Also note that 30 is a sum-difference number; i.e., 30 = (15)(2), 30 = (3)(10), and 15 – 2 = 13 = 3 + 10. Now consider the following chart which gives more sum-difference numbers.