Multiple solutions using CKP have been submitted and accepted on BOJ. I continuously attempt to find ways to make my code place a better position on the Python leaderboard.
Current Results
Note
Primality Testing
primality 0.0.6 gives false positives for several integers, such as 318665857834031151167461 or 3317044064679887385961981.
SymPy 1.13.3 uses Baillie-PSW primality testing for very large values.