We will consider odd natural numbers $n$ such that$$n|2023^n-1$$
$\textbf{a.}$ Find the smallest two such numbers.
$\textbf{b.}$ Prove that there exists infinitely many such $n$
1. **Part (a): Finding the smallest two such numbers**

   We need to find the smallest odd natural numbers \( n \) such that \( n \mid 2023^n - 1 \).

   - **For \( n = 3 \):**
     \[
     2023^3 - 1 = 2023 \times 2023 \times 2023 - 1 = 2023^3 - 1
     \]
     We need to check if \( 3 \mid 2023^3 - 1 \). Since \( 2023 \equiv 1 \pmod{3} \), we have:
     \[
     2023^3 \equiv 1^3 \equiv 1 \pmod{3}
     \]
     Thus,
     \[
     2023^3 - 1 \equiv 1 - 1 \equiv 0 \pmod{3}
     \]
     Therefore, \( 3 \mid 2023^3 - 1 \).

   - **For \( n = 9 \):**
     \[
     2023^9 - 1
     \]
     We need to check if \( 9 \mid 2023^9 - 1 \). Since \( 2023 \equiv 1 \pmod{9} \), we have:
     \[
     2023^9 \equiv 1^9 \equiv 1 \pmod{9}
     \]
     Thus,
     \[
     2023^9 - 1 \equiv 1 - 1 \equiv 0 \pmod{9}
     \]
     Therefore, \( 9 \mid 2023^9 - 1 \).

   Hence, the smallest two such numbers are \( 3 \) and \( 9 \).

2. **Part (b): Proving that there exist infinitely many such \( n \)**

   We will use induction to show that \( 3^k \) works for all \( k \geq 1 \).

   - **Base Case:**
     For \( k = 1 \), we have already shown that \( 3 \mid 2023^3 - 1 \).

   - **Inductive Step:**
     Assume that \( 3^k \mid 2023^{3^k} - 1 \) for some \( k \geq 1 \). We need to show that \( 3^{k+1} \mid 2023^{3^{k+1}} - 1 \).

     Consider \( n = 3^{k+1} \). We need to show that \( 3^{k+1} \mid 2023^{3^{k+1}} - 1 \).

     Using the properties of exponents, we have:
     \[
     2023^{3^{k+1}} - 1 = (2023^{3^k})^3 - 1
     \]
     By the inductive hypothesis, \( 3^k \mid 2023^{3^k} - 1 \). Let \( 2023^{3^k} - 1 = 3^k m \) for some integer \( m \).

     Then,
     \[
     (2023^{3^k})^3 - 1 = (1 + 3^k m)^3 - 1
     \]
     Expanding using the binomial theorem, we get:
     \[
     (1 + 3^k m)^3 - 1 = 1 + 3 \cdot 3^k m + 3 \cdot (3^k m)^2 + (3^k m)^3 - 1
     \]
     Simplifying, we have:
     \[
     3 \cdot 3^k m + 3 \cdot 3^{2k} m^2 + 3^{3k} m^3 = 3^{k+1} m + 3^{2k+1} m^2 + 3^{3k} m^3
     \]
     Since \( k \geq 1 \), all terms are divisible by \( 3^{k+1} \).

     Therefore, \( 3^{k+1} \mid 2023^{3^{k+1}} - 1 \).

     By induction, \( 3^k \mid 2023^{3^k} - 1 \) for all \( k \geq 1 \), proving that there are infinitely many such \( n \).

The final answer is \( \boxed{ 3 } \) and \( 9 \) for part (a), and the proof for part (b) shows that there are infinitely many such \( n \).