Find all triples $(a,b,c)$ of positive integers such that if $n$ is not divisible by any prime less than $2014$, then $n+c$ divides $a^n+b^n+n$.

[i]Proposed by Evan Chen[/i]
We need to find all triples \((a, b, c)\) of positive integers such that if \(n\) is not divisible by any prime less than \(2014\), then \(n+c\) divides \(a^n + b^n + n\).

We will consider two cases: \(c\) is even and \(c\) is odd.

### Case 1: \(c\) is even

1. **Choosing a prime \(p\):**
   - Pick \(p\) such that \(p \equiv 1 \pmod{2}\).
   - For each prime \(2 < q < 2013\), pick a residue \(r_q\) not equivalent to \(0\) or \(c\) modulo \(q\). This is possible since there are at least \(q-2 \geq 1\) residues remaining.
   - By the Chinese Remainder Theorem (CRT), these congruences can be combined into a single congruence \(p \equiv R \pmod{P}\), where \(P\) is the product of all primes less than \(2013\) and \(R\) is a positive integer.
   - Ensure \(p > \max(a, b, c, 2013)\). Such a \(p\) exists by Dirichlet's Theorem, and there are infinitely many such \(p\).

2. **Choosing \(n\):**
   - Let \(n = p - c\). Then \(n\) is a positive integer and is not divisible by any prime less than \(2013\) because \(p - c \equiv 1 \pmod{2}\) (since \(c\) is even and \(p\) is odd), and for each prime \(2 < q < 2013\), \(p \not\equiv c \pmod{q}\) by construction.

3. **Divisibility condition:**
   - We have \(p = n + c\) divides \(a^n + b^n + n\). By Fermat's Little Theorem (FLT), since \(p \nmid a, b\) (as \(p > \max(a, b, c, 2013)\)),
   \[
   a^p \equiv a \pmod{p} \quad \text{and} \quad b^p \equiv b \pmod{p}.
   \]
   - Therefore,
   \[
   a^n + b^n + n \equiv a^{p-c} + b^{p-c} + (p-c) \equiv \frac{a^p}{a^c} + \frac{b^p}{b^c} - c \equiv \frac{1}{a^{c-1}} + \frac{1}{b^{c-1}} - c \pmod{p}.
   \]
   - This implies
   \[
   b^{c-1} + a^{c-1} - ca^{c-1}b^{c-1} \equiv 0 \pmod{p}.
   \]
   - Since there are infinitely many such primes \(p\), \(b^{c-1} + a^{c-1} - ca^{c-1}b^{c-1}\) must be zero. Thus,
   \[
   b^{c-1} + a^{c-1} = ca^{c-1}b^{c-1}.
   \]

4. **Solving the equation:**
   - Without loss of generality, assume \(a \geq b\). Then,
   \[
   2a^{c-1} \geq a^{c-1} + b^{c-1} = ca^{c-1}b^{c-1}.
   \]
   - This implies
   \[
   2 \geq cb^{c-1}.
   \]
   - If \(c \geq 4\), then
   \[
   2 \geq 4b^3 \geq 4,
   \]
   which is a contradiction. Thus, \(c = 2\).

5. **Finding \(a\) and \(b\):**
   - With \(c = 2\),
   \[
   2 \geq 2b \implies b \leq 1.
   \]
   - Since \(b\) is a positive integer, \(b = 1\).
   - Substituting \(b = 1\) into the equation,
   \[
   1 + a = 2a \implies a = 1.
   \]
   - Therefore, \((a, b, c) = (1, 1, 2)\).

### Case 2: \(c\) is odd

1. **Choosing a prime \(p\):**
   - Pick \(p \equiv 1 \pmod{2}\).
   - For each prime \(2 < q < 2013\), pick a residue \(r_q\) not equivalent to \(0\) or \(\frac{c}{2}\) modulo \(q\). This is possible since \(q > 2\) and there are at least \(q-2 \geq 1\) residues remaining.
   - By CRT, these congruences can be combined into a single congruence \(p \equiv R \pmod{P}\), where \(P\) is the product of all primes less than \(2013\) and \(R\) is a positive integer.
   - Ensure \(p > \max(a, b, c, 2013)\). Such a \(p\) exists by Dirichlet's Theorem, and there are infinitely many such \(p\).

2. **Choosing \(n\):**
   - Let \(n = 2p - c\). Then \(n\) is a positive integer and is not divisible by any prime less than \(2013\) because \(2p - c \equiv 1 \pmod{2}\) (since \(c\) is odd), and for each prime \(2 < q < 2013\), \(p \not\equiv \frac{c}{2} \pmod{q}\) by construction.

3. **Divisibility condition:**
   - We have \(p \mid 2p = n + c\) divides \(a^n + b^n + n\). By FLT, since \(p \nmid a, b\) (as \(p > \max(a, b, c, 2013)\)),
   \[
   a^n + b^n + n \equiv a^{2p-c} + b^{2p-c} + (2p-c) \equiv \frac{(a^p)^2}{a^c} + \frac{(b^p)^2}{b^c} - c \equiv \frac{1}{a^{c-2}} + \frac{1}{b^{c-2}} - c \pmod{p}.
   \]
   - This implies
   \[
   b^{c-2} + a^{c-2} - ca^{c-2}b^{c-2} \equiv 0 \pmod{p}.
   \]
   - Since there are infinitely many such primes \(p\), \(b^{c-2} + a^{c-2} - ca^{c-2}b^{c-2}\) must be zero. Thus,
   \[
   b^{c-2} + a^{c-2} = ca^{c-2}b^{c-2}.
   \]

4. **Solving the equation:**
   - If \(c = 1\), then
   \[
   \frac{a + b - 1}{ab} = b^{-1} + a^{-1} - a^{-1}b^{-1} = 0,
   \]
   which implies \(a + b = 1\), but \(a + b \geq 2\) since \(a\) and \(b\) are positive integers. Thus, \(c = 1\) does not work.
   - Since \(c\) is odd, \(c \geq 3\). Without loss of generality, assume \(a \geq b\). Then,
   \[
   2a^{c-2} \geq a^{c-2} + b^{c-2} = ca^{c-2}b^{c-2}.
   \]
   - This implies
   \[
   2 \geq cb^{c-2} \geq 3b \geq 3,
   \]
   which is a contradiction. Thus, there are no solutions when \(c\) is odd.

### Conclusion
The only solution is \((a, b, c) = (1, 1, 2)\), and we've shown that it works.

The final answer is \( \boxed{ (1, 1, 2) } \).