Further lemmas about Nat.isPowerOfTwo, with the convenience of having bitwise lemmas available.

theorem Nat.not_isPowerOfTwo_zero : ¬isPowerOfTwo 0

theorem Nat.and_sub_one_testBit_log2 {n : Nat} (h : n ≠ 0) (hpow2 : ¬n.isPowerOfTwo) : (n &&& n - 1).testBit n.log2 = true

theorem Nat.and_sub_one_eq_zero_iff_isPowerOfTwo {n : Nat} (h : n ≠ 0) : n &&& n - 1 = 0 ↔ n.isPowerOfTwo

theorem Nat.ne_zero_and_sub_one_eq_zero_iff_isPowerOfTwo {n : Nat} : n ≠ 0 ∧ n &&& n - 1 = 0 ↔ n.isPowerOfTwo

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instance Nat.instDecidableIsPowerOfTwo {n : Nat} : Decidable n.isPowerOfTwo