Find all $n>1$ and integers $a_1,a_2,\dots,a_n$ satisfying the following three conditions:
(i) $2<a_1\le a_2\le \cdots\le a_n$
(ii) $a_1,a_2,\dots,a_n$ are divisors of $15^{25}+1$.
(iii) $2-\frac{2}{15^{25}+1}=\left(1-\frac{2}{a_1}\right)+\left(1-\frac{2}{a_2}\right)+\cdots+\left(1-\frac{2}{a_n}\right)$
1. **Rewriting Equation (iii):**
   Given the equation:
   \[
   2 - \frac{2}{15^{25} + 1} = \left(1 - \frac{2}{a_1}\right) + \left(1 - \frac{2}{a_2}\right) + \cdots + \left(1 - \frac{2}{a_n}\right)
   \]
   We can rearrange it to:
   \[
   2 - \frac{2}{15^{25} + 1} = n - \sum_{i=1}^n \frac{2}{a_i}
   \]
   Simplifying further, we get:
   \[
   \sum_{i=1}^n \frac{2}{a_i} = n - 2 + \frac{2}{15^{25} + 1}
   \]
   Dividing both sides by 2:
   \[
   \sum_{i=1}^n \frac{1}{a_i} = \frac{n}{2} - 1 + \frac{1}{15^{25} + 1}
   \]

2. **Analyzing the Divisors:**
   From conditions (i) and (ii), we know that \(a_1, a_2, \ldots, a_n\) are divisors of \(15^{25} + 1\). We need to find the possible values of \(a_i\).

3. **Bounding \(a_i\):**
   Since \(a_1 \le a_2 \le \cdots \le a_n\) and \(a_1 > 2\), we need to consider the possible divisors of \(15^{25} + 1\). Given the large size of \(15^{25} + 1\), we focus on small divisors. 

4. **Considering Small Divisors:**
   We need to check if \(a_i\) can be small integers. Since \(a_i\) must be greater than 2 and a divisor of \(15^{25} + 1\), we consider small prime factors and their powers.

5. **Checking \(n\):**
   We need to find \(n\) such that:
   \[
   \frac{n}{4} \geq \sum_{i=1}^n \frac{1}{a_i} = \frac{n}{2} - 1 + \frac{1}{15^{25} + 1} > \frac{n}{2} - 1
   \]
   This implies:
   \[
   \frac{n}{4} < 1 \implies n < 4
   \]
   Since \(n > 1\), we have \(n \in \{2, 3\}\).

6. **Case \(n = 2\):**
   If \(n = 2\), then:
   \[
   \sum_{i=1}^2 \frac{1}{a_i} = \frac{1}{2} + \frac{1}{15^{25} + 1}
   \]
   This implies:
   \[
   \frac{1}{a_1} + \frac{1}{a_2} = \frac{1}{2} + \frac{1}{15^{25} + 1}
   \]
   However, this is impossible since the left-hand side must be greater than or equal to \(\frac{1}{2}\), and the right-hand side is slightly more than \(\frac{1}{2}\).

7. **Case \(n = 3\):**
   If \(n = 3\), then:
   \[
   \sum_{i=1}^3 \frac{1}{a_i} = \frac{1}{2} + \frac{1}{15^{25} + 1}
   \]
   We need to find \(a_1, a_2, a_3\) such that:
   \[
   \frac{1}{a_1} + \frac{1}{a_2} + \frac{1}{a_3} = \frac{1}{2} + \frac{1}{15^{25} + 1}
   \]
   Given \(a_1 \le a_2 \le a_3\) and \(a_1, a_2, a_3\) are divisors of \(15^{25} + 1\), we test small values.

8. **Testing Small Values:**
   If \(a_2 \neq 4\), then:
   \[
   \frac{1}{2} < \sum_{i=1}^3 \frac{1}{a_i} \leq \frac{3}{8}
   \]
   This is a contradiction, implying \(a_2 = 4\). Thus, \(a_1 = 4\) by conditions (i) and (ii).

9. **Finding \(a_3\):**
   Setting \(a_1 = a_2 = 4\) in the equation:
   \[
   \frac{1}{4} + \frac{1}{4} + \frac{1}{a_3} = \frac{1}{2} + \frac{1}{15^{25} + 1}
   \]
   Simplifying, we get:
   \[
   \frac{1}{2} + \frac{1}{a_3} = \frac{1}{2} + \frac{1}{15^{25} + 1}
   \]
   Thus, \(a_3 = 15^{25} + 1\).

Conclusion:
The only solution of equation (iii) satisfying conditions (i) and (ii) is \(n = 3\) with \((a_1, a_2, a_3) = (4, 4, 15^{25} + 1)\).

The final answer is \( \boxed{ (4, 4, 15^{25} + 1) } \).