Reference was made earlier to the pair of figures generated by the even self-intersection/union of our outline triangle of 216. When filled, these are 1801/3601, respectively. Of particular interest at this point is the first figure, 1801. This is found as the sum of the unbroken sequence beginning at word 4 and continuing to word 8, thus:
Observe that this figure has sides of 25 units apiece, has a height of 49 and an outline of 144 - all square numbers. As a numerical hexagon it is unique, for we also observe the sum of the square roots of the first two (5 + 7) is equal to the square root of the third (12).
Vernon Jenkins MSc