  Heavy quark form factors are calculated at $\beta_0 \alpha_s \sim 1$ to all
orders in $\alpha_s$ at the first order in $1/\beta_0$. The $n_f^2 \alpha_s^3$
terms in the recent results [arXiv:1611.07535] for the vector form factors are
confirmed, and $n_f^{L-1} \alpha_s^L$ terms for higher $L$ are predicted.
