Let $(p_1, p_2, \dots) = (2, 3, \dots)$ be the list of all prime numbers, and $(c_1, c_2, \dots) = (4, 6, \dots)$ be the list of all composite numbers, both in increasing order. Compute the sum of all positive integers $n$ such that $|p_n - c_n| < 3$.

[i]Proposed by Brandon Wang[/i]
1. **Identify the sequences of prime and composite numbers:**
   - The sequence of prime numbers \( (p_1, p_2, \ldots) \) is \( 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, \ldots \).
   - The sequence of composite numbers \( (c_1, c_2, \ldots) \) is \( 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, \ldots \).

2. **Check the condition \( |p_n - c_n| < 3 \) for small values of \( n \):**
   - For \( n = 1 \):
     \[
     |p_1 - c_1| = |2 - 4| = 2 < 3
     \]
   - For \( n = 2 \):
     \[
     |p_2 - c_2| = |3 - 6| = 3 \not< 3
     \]
   - For \( n = 3 \):
     \[
     |p_3 - c_3| = |5 - 8| = 3 \not< 3
     \]
   - For \( n = 4 \):
     \[
     |p_4 - c_4| = |7 - 9| = 2 < 3
     \]
   - For \( n = 5 \):
     \[
     |p_5 - c_5| = |11 - 10| = 1 < 3
     \]
   - For \( n = 6 \):
     \[
     |p_6 - c_6| = |13 - 12| = 1 < 3
     \]

3. **Verify the condition \( p_n - c_n \geq 3 \) for \( n \geq 7 \):**
   - For \( n = 7 \):
     \[
     p_7 = 17, \quad c_7 = 14 \quad \Rightarrow \quad p_7 - c_7 = 17 - 14 = 3
     \]
   - For \( n = 8 \):
     \[
     p_8 = 19, \quad c_8 = 15 \quad \Rightarrow \quad p_8 - c_8 = 19 - 15 = 4
     \]
   - For \( n = 9 \):
     \[
     p_9 = 23, \quad c_9 = 16 \quad \Rightarrow \quad p_9 - c_9 = 23 - 16 = 7
     \]
   - For \( n = 10 \):
     \[
     p_{10} = 29, \quad c_{10} = 18 \quad \Rightarrow \quad p_{10} - c_{10} = 29 - 18 = 11
     \]

   From these calculations, it is evident that for \( n \geq 7 \), \( p_n - c_n \geq 3 \).

4. **Sum the values of \( n \) that satisfy \( |p_n - c_n| < 3 \):**
   - The values of \( n \) that satisfy the condition are \( n = 1, 4, 5, 6 \).
   - Sum these values:
     \[
     1 + 4 + 5 + 6 = 16
     \]

The final answer is \( \boxed{16} \).