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.
?(CoprimeQ[#, (p-1)] &)]; Array[a, 70] (* _James C. McMahon's wiki page.
?(CoprimeQ[#, (p-1)] &)]; Array[a, 70] (* _James C. McMahon has authored 0 sequences.