Answers are grounded in this paper and cite their sources.
W. V. Parker, J. S. Guerin, Howard Eves, Walter B. Clarke, Nev. R. Mind, H. J. Zimmerberg, Frank C. Gentry, Nicholas Kushta, W. S. Loud, Julius S. Miller, Frank Hawthorne, Fred G. Fender, W. T. Short, P. T. Thomas, Emory P. Starke, A. Sisk, A. B. Farnell, V. Thebault, H. S. Grant, N. A. Court, E. P. Starke, D. L. MacKay, Problem Department, National Mathematics Magazine, Vol. 19, No. 6 (Mar., 1945), pp. 313-324
No takes yet. Share an insight, caveat, or question.
Parker et al. (1945) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: