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== Variants ==
Costas arrays on a [[hexagonal lattice]] are known as ''honeycomb arrays''. It has been shown that there are only finitely many such arrays, which must have an odd number of elements, arranged in the shape of a hexagon. Currently, 12 such arrays (up to symmetry) are known, which has been conjectured to be the total number.<ref>{{Cite journal|last=Blackburn|first=Simon R.|last2=Panoui|first2=Anastasia|last3=Paterson|first3=Maura B.|last4=Stinson|first4=Douglas R.|date=2010-12-10|title=Honeycomb Arrays|url=https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1r172|journal=The Electronic Journal of Combinatorics|language=en|pages=R172–R172|doi=10.37236/444|issn=1077-8926}}</ref>
== See also ==
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