27 (number)

Including the null-motif, there are 27 distinct hypergraph motifs.

[1] There are exactly twenty-seven straight lines on a smooth cubic surface,[2] which give a basis of the fundamental representation of Lie algebra

[3][4] The unique simple formally real Jordan algebra, the exceptional Jordan algebra of self-adjoint 3 by 3 matrices of quaternions, is 27-dimensional;[5] its automorphism group is the 52-dimensional exceptional Lie algebra

[8] In Robin's theorem for the Riemann hypothesis, twenty-seven integers fail to hold

is the Euler–Mascheroni constant; this hypothesis is true if and only if this inequality holds for every larger

[9][10][11] The Clebsch surface has 27 exceptional lines can be defined over the real numbers.

It is possible to arrange 27 vertices and connect them with edges to create the Holt graph.