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.
?PrimeQ] >= Count[Range[#^2, # NextPrime[#]], 's wiki page.
?PrimeQ] >= Count[Range[#^2, # NextPrime[#]], has authored 0 sequences.