  We study a class of almost scale-invariant modified gravity theories, using a
particular form of $f(R, G) = \alpha R^2 + \beta G \log G$ where $R$ and $G$
are the Ricci and Gauss-Bonnet scalars, respectively and $\alpha$, $\beta$ are
arbitrary constants. We derive the Einstein-like field equations to first order
in cosmological perturbation theory in longitudinal gauge.
