Read the list of individuals to whom this "sophisticated" personality clustering technique was sent.
You've got people like A.V. Aho, R.W. Hamming, J.B. Kruskal, J.R. Pierce, K. L. Thompson, J.W. Tukey (and probably more who I didn't recognize).
That sort of sheer concentration of talent is a rare and precious thing.
From UNIX fame: M.D. McIlroy and R. Morris (father of the Morris who wrote the Morris worm)
The series 1, 4, 6, 8, ? might be better applicable to general jobs as an assessment of a persons mathematical knowledge.
Maybe, but I still found this fun to pass around the lab, haha.