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.
?(IntegerQ[Sqrt[#]]&)]==2&&Count[ n,'s wiki page.
?(IntegerQ[Sqrt[#]]&)]==2&&Count[ n, has authored 0 sequences.