The Fibonacci sequence is defined by $F_1 = F_2 = 1$ and $F_{n+2} = F_{n+1}+F_n$ for every integer $n$. Let $k$ be a fixed integer. A sequence $(a_n)$ of integers is said to be $\textit{phirme}$ if $a_n + a_{n+1} = F_{n+k}$ for all $n \geq 1$. Find all $\textit{phirme}$ sequences in terms of $n$ and $k$.
1. **Define the Fibonacci sequence and the phirme sequence condition:**
   The Fibonacci sequence is defined by:
   \[
   F_1 = F_2 = 1 \quad \text{and} \quad F_{n+2} = F_{n+1} + F_n \quad \text{for all integers } n.
   \]
   A sequence \((a_n)\) is said to be phirme if:
   \[
   a_n + a_{n+1} = F_{n+k} \quad \text{for all } n \geq 1.
   \]

2. **Express the phirme condition in terms of Fibonacci numbers:**
   Given the condition \(a_n + a_{n+1} = F_{n+k}\), we can rewrite it using the Fibonacci recurrence relation:
   \[
   F_{n+k} = F_{n+k-1} + F_{n+k-2}.
   \]
   Therefore, we have:
   \[
   a_n + a_{n+1} = F_{n+k-1} + F_{n+k-2}.
   \]

3. **Introduce a new sequence \(b_n\):**
   Let \(b_n = a_n - F_{n+k-2}\). Then:
   \[
   b_n + b_{n+1} = (a_n - F_{n+k-2}) + (a_{n+1} - F_{n+k-1}).
   \]
   Substituting the phirme condition, we get:
   \[
   b_n + b_{n+1} = (a_n + a_{n+1}) - (F_{n+k-2} + F_{n+k-1}) = F_{n+k} - F_{n+k} = 0.
   \]
   Hence:
   \[
   b_n + b_{n+1} = 0.
   \]

4. **Solve the recurrence relation for \(b_n\):**
   The equation \(b_n + b_{n+1} = 0\) implies:
   \[
   b_{n+1} = -b_n.
   \]
   Let \(b_1 = d\), where \(d\) is an integer. Then:
   \[
   b_2 = -d, \quad b_3 = d, \quad b_4 = -d, \quad \text{and so on}.
   \]
   Therefore, we have:
   \[
   b_{2i+1} = d \quad \text{and} \quad b_{2i} = -d \quad \text{for all integers } i.
   \]

5. **Express \(a_n\) in terms of \(F_{n+k-2}\) and \(d\):**
   Since \(b_n = a_n - F_{n+k-2}\), we get:
   \[
   a_n = b_n + F_{n+k-2}.
   \]
   Substituting the values of \(b_n\), we obtain:
   \[
   a_{2i+1} = F_{2i+k-1} + d \quad \text{and} \quad a_{2i} = F_{2i+k-1} - d.
   \]
   Therefore, the general form for \(a_n\) is:
   \[
   a_n = F_{n+k-2} + (-1)^{n-1} d,
   \]
   where \(d\) is any integer.

The final answer is \(\boxed{a_n = F_{n+k-2} + (-1)^{n-1} d}\).