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A006616
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Zarankiewicz's problem k_4(n).
(Formerly M4998)
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8
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OFFSET
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4,1
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COMMENTS
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a(n) is the least k such that every n X n {0,1}-matrix with k ones contains an all ones 4 X 4 submatrix. - Sean A. Irvine, May 17 2017
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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R. K. Guy, A problem of Zarankiewicz, Research Paper No. 12, Dept. of Math., Univ. Calgary, Jan. 1967. [Annotated and scanned copy, with permission]
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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