Narrow Results

We give a description of a class of numerical semigroups with embedding dimension equal to 4, defined by four pairwise relatively prime nonnegative integers $n$, $x$, $y_1$ and $y_2$ such that $y_1+y_2=tn$, for $t\ge 2$ and $t\in \mathbb{N}$. Such description provides a mode to determine the characteristics of the corresponding numerical semigroups: the Frobenius number, gaps, genus, etc.