The conversation between human and AI assistant.
[|Human|] Read the string of numbers and determine what is being described.
[|AI|] The input is a string of numbers: 2, 3, 7, 11, and 15. These numbers appear to be individual integers, listed in ascending order, rather than a sequence that follows a specific pattern.
[|Human|] 
Read the string of numbers and determine what is being described.