  Let $\Bbbk$ be an arbitrary field and let $b > 1, n > 1$ and $a$ be three
positive integers. In this paper we explicitly describe a minimal $S-$graded
free resolution of the semigroup algebra $\Bbbk[S]$ when $S$ is a generalized
repunit numerical semigroup, that is, when $S$ is the submonoid of $\mathbb{N}$
generated by $\{a_1, a_2, \ldots, a_n\}$ where $a_1 = \sum_{j=0}^{n-1} b^j$ and
$a_i - a_{i-1} = a\, b^{i-2},\ i = 2, \ldots, n$, with $\gcd(a,a_1) = 1$.
