The board / graph theory / #1011
Erdős Problem #1011
OPENdatabase updated 2025-09-10
No proof or disproof is known, and it isn't known whether a finite computation could settle it.
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Topicsgraph theory
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[d] Exhaustive generation plus independently validated colouring certificates give \(f_4(11)=21\), \(f_4(12)=26\), \(f_4(13)=31\), and \(f_4(14)=36\); the general problem remains open.
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