Find all strictly increasing sequences of positive integers $a_1, a_2, \ldots$ with $a_1=1$, satisfying $$3(a_1+a_2+\ldots+a_n)=a_{n+1}+\ldots+a_{2n}$$ for all positive integers $n$.
To find all strictly increasing sequences of positive integers \( a_1, a_2, \ldots \) with \( a_1 = 1 \), satisfying the condition
\[ 3(a_1 + a_2 + \ldots + a_n) = a_{n+1} + \ldots + a_{2n} \]
for all positive integers \( n \), we will use mathematical induction.

1. **Base Case:**
   - For \( n = 1 \), we have \( a_1 = 1 \).
   - The given condition becomes:
     \[
     3(a_1) = a_2
     \]
     Substituting \( a_1 = 1 \), we get:
     \[
     3 \cdot 1 = a_2 \implies a_2 = 3
     \]
   - Thus, the sequence starts as \( a_1 = 1 \) and \( a_2 = 3 \).

2. **Inductive Step:**
   - Assume the sequence \( a_1, a_2, \ldots, a_{2n} \) satisfies \( a_i = 2i - 1 \) for \( i = 1, 2, \ldots, 2n \).
   - We need to show that \( a_{2n+1} = 4n + 1 \) and \( a_{2n+2} = 4n + 3 \) satisfy the given condition.

3. **Inductive Hypothesis:**
   - By the inductive hypothesis, we have:
     \[
     a_i = 2i - 1 \quad \text{for} \quad i = 1, 2, \ldots, 2n
     \]
   - Therefore, the sum of the first \( n \) terms is:
     \[
     a_1 + a_2 + \ldots + a_n = \sum_{i=1}^n (2i - 1) = n^2
     \]
   - The sum of the next \( n \) terms is:
     \[
     a_{n+1} + a_{n+2} + \ldots + a_{2n} = \sum_{i=n+1}^{2n} (2i - 1) = \sum_{i=1}^{2n} (2i - 1) - \sum_{i=1}^n (2i - 1) = (2n)^2 - n^2 = 3n^2
     \]
   - This satisfies the given condition:
     \[
     3(a_1 + a_2 + \ldots + a_n) = a_{n+1} + \ldots + a_{2n}
     \]

4. **Next Terms:**
   - Consider the next terms \( a_{2n+1} \) and \( a_{2n+2} \).
   - We need to show that:
     \[
     3(a_1 + a_2 + \ldots + a_{n+1}) = a_{n+2} + \ldots + a_{2n+2}
     \]
   - By the inductive hypothesis, we have:
     \[
     a_1 + a_2 + \ldots + a_{n+1} = n^2 + (2n + 1) = n^2 + 2n + 1 = (n+1)^2
     \]
   - The sum of the next \( n+1 \) terms is:
     \[
     a_{n+2} + a_{n+3} + \ldots + a_{2n+2} = \sum_{i=n+2}^{2n+2} (2i - 1) = \sum_{i=1}^{2n+2} (2i - 1) - \sum_{i=1}^{n+1} (2i - 1) = (2n+2)^2 - (n+1)^2 = 4n^2 + 8n + 4 - n^2 - 2n - 1 = 3n^2 + 6n + 3
     \]
   - This satisfies the given condition:
     \[
     3(a_1 + a_2 + \ldots + a_{n+1}) = a_{n+2} + \ldots + a_{2n+2}
     \]

5. **Conclusion:**
   - By induction, the sequence \( a_n = 2n - 1 \) satisfies the given condition for all positive integers \( n \).

The final answer is \( \boxed{ a_n = 2n - 1 } \).