cases b with
| zero => simp
| succ b =>
  rw [← Finset.prod_range_mul_prod_Ico _ (Nat.zero_lt_succ _)]
  simp
b n : ℕ
⊢ ∏ p in Finset.range b, p ^ ↑(Nat.factorization n) p = ∏ p in Finset.Ico 1 b, p ^ ↑(Nat.factorization n) p
no goals