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.
?(# == 4 p &)][[1]] - FirstPosition[s, 's wiki page.
?(# == 4 p &)][[1]] - FirstPosition[s, has authored 0 sequences.