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.
>= 10**$e; $s++ if is_quasi_carmichael($'s wiki page.
>= 10**$e; $s++ if is_quasi_carmichael($ has authored 0 sequences.