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.
?(CompositeQ[#] && PowerMod[k, # - 1, #] == 1 &)]; seq[kmax's wiki page.
?(CompositeQ[#] && PowerMod[k, # - 1, #] == 1 &)]; seq[kmax has authored 0 sequences.