Loeschian number
In number theory, the numbers of the form x2 + xy + y2 for integer x, y are called the
Loeschian numbers. These numbers are named after August Lösch. They are the norms of the Eisenstein integers. They are a set of whole numbers, including zero, and having prime factorization in which all primes congruent to 2 mod 3 have even powers.
