  An effective field theory is used to describe light nuclei, calculated from
quantum chromodynamics on a lattice at unphysically large pion masses. The
theory is calibrated at leading order to two available data sets on two- and
three-body nuclei for two pion masses. At those pion masses we predict the
quartet and doublet neutron-deuteron scattering lengths, and the alpha-particle
binding energy. For $m_\pi=510~$MeV we obtain, respectively, $^4a_{\rm
nD}=2.3\pm 1.3~$fm, $^2a_{\rm nD}=2.2\pm 2.1~$fm, and $B_{\alpha}^{}=35\pm
22~$MeV, while for $m_\pi=805~$MeV $^4a_{\rm nD}=1.6\pm 1.3~$fm, $^2a_{\rm
nD}=0.62\pm 1.0~$fm, and $B_{\alpha}^{}=94\pm 45~$MeV are found. Phillips- and
Tjon-like correlations to the triton binding energy are established.
Higher-order effects on the respective correlation bands are found insensitive
to the pion mass. As a benchmark, we present results for the physical pion
mass, using experimental two-body scattering lengths and the triton binding
energy as input. Hints of subtle changes in the structure of the triton and
alpha particle are discussed.
