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An equation of the form y=ax^3+bx^2+cx+d where only one root is real.

The first quadratic nonresidue mod p of a number is always less than 3(lnp)^2/2 (Wedeniwski 2001).

For n>=3, there exist no additive finite and invariant measures for the group of displacements in R^n.

The numbers B_(n,k)(1!,2!,3!,...)=(n-1; k-1)(n!)/(k!), where B_(n,k) is a Bell polynomial.

The Fermat number F_n is prime iff 3^(2^(2^n-1))=-1 (mod F_n).

A group G is quasi-unipotent if every element of G of order p is unipotent for all primes p such that G has p-group rank >=3.

The Ree group R(q) is the automorphism group of a S(2,q+1,q^3+1) Steiner system.

A three-colorable graph G is a graph with chromatic number chi(G)<=3.

Let graph G have p points v_i and graph H have p points u_i, where p>=3. Then if for each i, the subgraphs G_i=G-v_i and H_i=H-u_i are isomorphic, then the graphs G and H are ...

Three-dimensional generalization of the polyominoes to n dimensions. The number of polycubes N(n) composed of n cubes are 1, 1, 2, 8, 29, 166, 1023, ... (OEIS A000162; Ball ...