ZarankiewiczDB,

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z(14,27) = 84

R. K. Guy [Guy69] gave an incorrect value of 83.

submitted by Andrew Kay on April 22nd, 2016 (link)

By Roman's bound with $p=3$. [Rom75]

upper bound = 84, submitted on April 22nd, 2016 (link)

By deleting a column of weight 2 from Matrix 3.

lower bound = 84, submitted by Andrew Kay on April 22nd, 2016 (link)

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