Positive-definite ternary quadratic forms which are (4,1)-universal and (4,3)-universal

Abstract

We discuss the problem of determining all positive-definite ternary quadratic forms with integral coefficients which represent all positive integers $n \equiv 1 \pmod 4$ and similarly $n \equiv 3 \pmod 4$.

Publication
In INTEGERS, Volume 18 (2018), A92