simp [digits_append_digits (zero_lt_of_lt hb)]
case zero
b n : ℕ
hb : 1 < b
⊢ ∀ {m : ℕ}, 0 < m → b.digits n ++ List.replicate 0 0 ++ b.digits m = b.digits (n + b ^ (0 + (b.digits n).length) * m)
no goals