Honestly this was just guess-work based on intuition, but I'm sure there's some mathematical explanation behind it.

good one. I want to understand how this works. Is there any mathematical formala and proof for this? Please share

Test case fails with below error:

Traceback (most recent call last):
File "/workspace/default/.venv/lib/python3.11/site-packages/codewars_test/test_framework.py", line 112, in wrapper
func()
File "/workspace/default/tests.py", line 17, in basic_test_cases
test.assert_equals(pell.get(inp), exp)
^^^^^^^^^^^^^
TypeError: Pell.get() missing 1 required positional argument: 'n'

Just my lucky guess. Because of test cases count and description. But I don't understand why it is works so. Can anybody explain me? :)

lol, that's funny ;-)

No.

Is this a joke?

I should have listened when the description said "this kata is not about coding skills..."

what if the 'order' contains the value 0x7fffffff (i.e 2147483647, max 32 bit value)? :) code crashes