Yes, the sequence $1, 5, 9, 13$ is an arithmetic sequence.

An arithmetic sequence is one where the difference between consecutive terms is constant. To verify this:

• $5 - 1 = 4$
• $9 - 5 = 4$
• $13 - 9 = 4$

The common difference is $4$, which remains consistent between each term. Therefore, this sequence is arithmetic.

Would you like more details or have any questions?

Here are five related questions:

1. What is the formula for the $n$-th term of this arithmetic sequence?
2. How do you find the sum of the first $n$ terms of an arithmetic sequence?
3. Can you identify the common difference in another arithmetic sequence?
4. What are the first five terms of an arithmetic sequence with a common difference of $3$ and a starting term of $2$?
5. How can you determine if a given sequence is arithmetic?

Tip: Always check the difference between consecutive terms to quickly identify an arithmetic sequence.