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A006620 Zarankiewicz's problem.
(Formerly M3775)

%I M3775

%S 5,8,11,15,19,23,27,32,37,43,49,54,59,64

%N Zarankiewicz's problem.

%C a(n) is the least k such that every n X (n+1) {0,1}-matrix with k ones contains an all ones 2 X 2 submatrix. - _Sean A. Irvine_, May 18 2017

%D R. K. Guy, A many-facetted problem of Zarankiewicz, Lect. Notes Math. 110 (1969), 129-148.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%K nonn,more

%O 2,1

%A _N. J. A. Sloane_.

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Last modified April 14 12:11 EDT 2021. Contains 342949 sequences. (Running on oeis4.)