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A recursive computer program has shown that $m(4)\ge20$.

Copyright American Mathematical Society 1996

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Article Info

• ERA Amer. Math. Soc. 01 (1995), pp. 112-113
• Publisher Identifier: S1079-6762(95)03004-1
• 1991 Mathematics Subject Classification. Primary 05A05; Secondary 05B30, 05D05 .
• Received by the editors June 10, 1995, and, in revised form, October 9, 1995
• Communicated by Ronald Graham
• Comments (When Available)

Gregory M. Manning

Department of Mathematical Sciences, Northern Illinois University, DeKalb, IL, 60115.

E-mail address: manning@math.niu.edu