Article date: Jan 1963
Article title: The author pays his annual visit to Dr. Matrix, the numerologist
Mathematical Games column? Y
Book: 4. The Magic Numbers of Dr. Matrix
Chapter: 3. Sing Sing
This data confirmed? yes
Notes
Peter Rowlett (5 September 2022):
Peter Rowlett initial guess (Very uncertain)
Peter Rowlett (29 October 2023):
I have seen this chapter and column side-by-side and they match.