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.
== 34} sieve_prime_cluster(1,1e9,16,18,34); # _Dana Jacobsen's wiki page.
== 34} sieve_prime_cluster(1,1e9,16,18,34); # _Dana Jacobsen has authored 0 sequences.