This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
?(#+FromDigits[Reverse[ IntegerDigits[#]]] ==n&)]==8; Select[Range[20000],krk8Q] (* _Harvey P. Dale has authored 0 sequences.