Palindromes:
11209 + 2 = 11211 (Palindrome)
11211 => is itself a Palindrome

Read the description again about what an interesting number is, in those tests, the list is awesome_phrases in your function and are numbers that don't comply with the conditions stated in the description but should be taken as such anyways.

{'n': 11209, 'interesting': [1337, 256], 'expected': 1},
{'n': 11211, 'interesting': [1337, 256], 'expected': 2},

How are either of these test cases expected 1 or 2? Both interesting numbers are way lower than n